CN113611812B - Display panel, manufacturing method thereof and display device - Google Patents
Display panel, manufacturing method thereof and display device Download PDFInfo
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- CN113611812B CN113611812B CN202110902456.7A CN202110902456A CN113611812B CN 113611812 B CN113611812 B CN 113611812B CN 202110902456 A CN202110902456 A CN 202110902456A CN 113611812 B CN113611812 B CN 113611812B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 239000000758 substrate Substances 0.000 claims abstract description 98
- 238000000059 patterning Methods 0.000 claims abstract description 20
- 239000003086 colorant Substances 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims description 85
- 238000000034 method Methods 0.000 claims description 48
- 230000000149 penetrating effect Effects 0.000 claims description 14
- 108010001267 Protein Subunits Proteins 0.000 claims description 10
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 238000000151 deposition Methods 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
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 6
- 239000007772 electrode material Substances 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
- 229910052709 silver Inorganic materials 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 10
- 230000008569 process Effects 0.000 description 19
- 238000010586 diagram Methods 0.000 description 16
- 229920001621 AMOLED Polymers 0.000 description 9
- 238000002834 transmittance Methods 0.000 description 7
- 229910044991 metal oxide Inorganic materials 0.000 description 6
- 150000004706 metal oxides Chemical class 0.000 description 6
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 150000002680 magnesium Chemical class 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000011368 organic material Substances 0.000 description 4
- 238000004544 sputter deposition Methods 0.000 description 4
- 229910001316 Ag alloy Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 150000004982 aromatic amines Chemical class 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- ZTLUNQYQSIQSFK-UHFFFAOYSA-N n-[4-(4-aminophenyl)phenyl]naphthalen-1-amine Chemical compound C1=CC(N)=CC=C1C(C=C1)=CC=C1NC1=CC=CC2=CC=CC=C12 ZTLUNQYQSIQSFK-UHFFFAOYSA-N 0.000 description 2
- ODHXBMXNKOYIBV-UHFFFAOYSA-N triphenylamine Chemical compound C1=CC=CC=C1N(C=1C=CC=CC=1)C1=CC=CC=C1 ODHXBMXNKOYIBV-UHFFFAOYSA-N 0.000 description 2
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- YVTHLONGBIQYBO-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O--].[Zn++].[In+3] YVTHLONGBIQYBO-UHFFFAOYSA-N 0.000 description 1
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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
-
- 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
-
- 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 arranged on a cathode layer and a patterned covering layer which is arranged 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, thereby improving the IR drop problem of the cathode; the patterning covering layer is manufactured above the cathode layer and the auxiliary cathode, and the thickness of the covering units corresponding to the organic light-emitting units with different colors is different, so that the light-emitting layers with different colors can be ensured to have good light-emitting effect, and the light-emitting rate of the display panel is improved.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a display panel, a manufacturing method thereof, and a display device.
Background
In recent years, as a new type of display device, an OLED (Organic Light-Emitting Diode) has been attracting attention because of its advantages of self-luminescence, thinness, wide viewing angle, fast reaction time, high luminous efficiency, low driving voltage, small power consumption, simple manufacturing process, and applicability to flexible display fields.
In the conventional AMOLED (Active Matrix OLED, active matrix organic light emitting diode) of the top emission structure, the cathode structure is critical, and the thickness of the cathode directly determines the light transmittance. In the case of small-sized AMOLED, the metal cathode is made thin in order to ensure sufficient light transmittance, and although the resistance of the cathode has an influence on the uniformity of the OLED panel, it is the small size that causes the influence of the cathode resistance to be within an acceptable range. However, for large-size AMOLED, the metal cathode has a serious resistance drop (IR drop), so that the uniformity of the OLED panel is poor, the ornamental effect is poor, and the application of the process method in large size is affected.
In the prior art, the IR drop problem of the cathode can be improved by manufacturing a transparent metal oxide cathode, but the transparent metal oxide is usually prepared by adopting a sputtering process, such as Indium Zinc Oxide (IZO), and the sputtering process has high energy, so that the organic material layer in the OLED device is easily damaged, the injection efficiency, the service life and other performances of the OLED device are further affected, and the method for using the transparent metal oxide as the cathode is limited.
In the prior art, the cathode IR drop problem can be improved through an auxiliary cathode design, but the cover layer material is remained in the light-emitting area, so that the light-emitting rate can be influenced to a certain extent, and the light-emitting efficiency of the device is influenced.
Disclosure of Invention
The application provides a display panel, a manufacturing method thereof and a display device aiming at the defects of the prior art, and can improve the light emitting efficiency of the display panel while improving the cathode IR drop problem of the AMOLED display panel.
In a first aspect, embodiments of the present application provide 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 located at one side of the substrate and including a plurality of anode units located at the light emitting region;
the pixel definition layer is positioned on one side of the anode layer 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 unit 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 in one of the pixel openings;
a cathode layer covering the plurality of pixel openings and the plurality of organic light emitting units;
an auxiliary cathode, which is positioned on one side of the cathode layer far away from the substrate, and the orthographic projection of the auxiliary cathode on the substrate is positioned in the dark area;
the patterning covering layer is positioned on one side of the cathode layer 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 organic light emitting unit includes a red light emitting unit, a green light emitting unit, and a blue light emitting unit; the cover unit comprises a first cover unit positioned on the red light-emitting unit, a second cover unit positioned on the green light-emitting unit and a third cover 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, the thickness of the first covering unitThickness of the second cover unitThe thickness of the third cover unit +.>
Optionally, the patterned cover layer includes 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 the part of the common cover layer, which is positioned in the blue light-emitting unit, is a third cover unit; the first covering layer comprises a plurality of first subunits, the orthographic projection of the first subunits on the substrate covers the orthographic projection of the red light emitting units on the substrate, and the first covering unit comprises a part of the common covering layer and the first subunits which are positioned on the red light emitting units; the second cover layer comprises a plurality of second sub-units, the orthographic projection of the second sub-units on the substrate covers the orthographic projection of the green light-emitting units on the substrate, and the second cover unit comprises a part of the common cover layer and the second sub-units on the green light-emitting units.
Optionally, the material of the cathode layer comprises one or alloy of magnesium, silver and aluminum, and the thickness of the cathode layer is 5 nm-20 nm.
Optionally, the material of the auxiliary cathode comprises one or alloy of magnesium, silver and aluminum, and the thickness of the auxiliary cathode is 1 nm-500 nm.
In a second aspect, embodiments of the present application provide a display device including 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 performing patterning treatment on the anode layer to obtain a plurality of anode units positioned in the light-emitting area;
forming a pixel definition layer on the anode layer, and carrying out patterning treatment on the pixel definition layer to form a plurality of pixel openings penetrating through the pixel definition layer, wherein orthographic projection of the pixel openings on the substrate is positioned in orthographic projection of the anode unit on the substrate;
forming an organic light emitting layer including a plurality of organic light emitting units, each of the organic light emitting units being located in one of the pixel openings;
forming a cathode layer covering the plurality of pixel openings and the plurality of organic light emitting units;
forming an auxiliary cathode on the cathode layer, wherein the orthographic projection of the auxiliary cathode on the substrate is positioned in a dark area;
and forming a patterned covering layer, wherein the patterned covering layer is positioned on one side of the cathode layer 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, assisting the cathode on the cathode layer, comprising:
forming a first photosensitive material layer on one side of the cathode layer away from the substrate, and performing patterning treatment 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 positioned in the dark area;
depositing an auxiliary electrode material layer, wherein the auxiliary electrode material layer covers the rest first photosensitive material layer and the cathode layer at the first opening;
and 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 cover unit comprises a first cover unit positioned on the red light-emitting unit, a second cover unit positioned on the green light-emitting unit and a third cover unit positioned on the blue light-emitting unit;
forming a patterned capping layer comprising:
depositing a common cover layer, wherein the common cover layer covers the cathode layer and the auxiliary cathode, and the part of the common cover layer, which is positioned in the blue light-emitting unit, is a third cover unit;
forming a second photosensitive material layer on one side of the public covering layer far away from the substrate, and carrying out patterning treatment 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 residual second photosensitive material layer and the public cover layer at the second opening, and stripping the residual second photosensitive material layer to obtain the first cover layer, the first cover layer comprises a plurality of first sub-units, and the first cover unit comprises the public cover layer and the first sub-units which are positioned on the red light emitting unit;
forming a third photosensitive material layer on one side of the first covering layer far away from the substrate, and performing patterning treatment on the third photosensitive material layer to form a third opening penetrating through the third photosensitive material layer, wherein the orthographic projection of the third opening on the substrate is positioned in the 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 rest of the third photosensitive material layer and the public cover layer at the third opening, and stripping the rest of the third photosensitive material layer to obtain the second cover layer, the second cover layer comprises a plurality of second sub-units, and the second cover unit comprises a part of the public cover layer and the second sub-units which are positioned on the green light emitting unit.
The beneficial technical effects that technical scheme that this application embodiment provided brought are:
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 patterning covering layer is manufactured above the cathode layer and the auxiliary cathode, and comprises a plurality of covering units, and the thickness of the covering units corresponding to the organic light-emitting units with different colors is different, so that the light-emitting layers with different colors can have good light-emitting effect, and the light-emitting rate of the display panel is improved.
Additional aspects and advantages of the 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 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, in which:
fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of another display panel according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a frame structure of a display device according to an embodiment of the present application;
fig. 4 is a flow chart of a method for manufacturing a display panel according to an embodiment of the present application;
FIG. 5 is a schematic process diagram of step S1 in the method for fabricating the display panel shown in FIG. 4;
FIG. 6 is a schematic process diagram of step S2 in the method for fabricating the display panel shown in FIG. 4;
FIG. 7 is a schematic process diagram of step S3 in the method for fabricating the display panel shown in FIG. 4;
FIG. 8 is a schematic process diagram of step S4 in the method for fabricating the display panel shown in FIG. 4;
FIG. 9 is a schematic process diagram of step S5 in the method for fabricating the display panel shown in FIG. 4;
FIG. 10 is a flowchart illustrating a step S5 in the method for fabricating the display panel shown in FIG. 4;
FIG. 11 is a schematic process diagram of step S501 in the method for fabricating the display panel shown in FIG. 10;
FIG. 12 is a schematic process diagram of step S502 in the method for fabricating the display panel shown in FIG. 10;
FIG. 13 is a schematic process diagram of step S6 in the method for fabricating the display panel shown in FIG. 4;
FIG. 14 is a schematic process diagram of step S601 in the method for fabricating the display panel shown in FIG. 13;
FIG. 15 is a schematic process diagram of step S602 in the method for fabricating the display panel shown in FIG. 13;
FIG. 16 is a schematic process diagram of step S603 in the method for fabricating a display panel shown in FIG. 13;
fig. 17 is a schematic structural diagram of the display panel after step S603 in the method for manufacturing a display panel shown in fig. 13;
FIG. 18 is a schematic process diagram of step S604 in the manufacturing method of the display panel shown in FIG. 13;
fig. 19 is a flowchart illustrating step S605 in 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; an R-red light emitting unit; a G-green light emitting unit; a B-blue light emitting unit;
a 5-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 region; 20-dark area;
100-a first covering unit; 200-a second covering unit; 300-a third covering unit;
m 1-a first photosensitive material layer; m 2-a second photosensitive material layer; m 3-a third photosensitive material layer.
Detailed Description
Examples of embodiments of the present application are illustrated in the accompanying drawings, in which like or similar reference numerals refer to like or similar elements or elements having like or similar functionality throughout. Further, if detailed description of the known technology is not necessary for the illustrated features of the present application, it will be omitted. The embodiments described below by referring to the drawings are exemplary only for the purpose of illustrating the present application and are not to be construed as limiting the present application.
It will be understood by those skilled in the art that 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 unless defined otherwise. 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 expressly stated otherwise, as understood by those skilled in the art. 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 of the top emission structure, a cathode structure is critical, and the thickness of a cathode directly determines light transmittance. In the case of small-sized AMOLED, the metal cathode is made thin in order to ensure sufficient light transmittance, and although the resistance of the cathode has an influence on the uniformity of the OLED panel, it is the small size that causes the influence of the cathode resistance to be within an acceptable range. However, for large-size AMOLED, the metal cathode has a serious resistance drop (IR drop), so that the uniformity of the OLED panel is poor, the ornamental effect is poor, and the application of the process method in large size is affected.
In the prior art, the cathode IR drop problem can be improved by manufacturing a transparent metal oxide cathode, but in the case of IZO, the transparent metal oxide is usually prepared by adopting a sputtering process, for example, the sputtering process has larger energy, and the organic material layer in the OLED device is easily damaged, so that the injection efficiency, the service life and other performances of the OLED device are affected, and therefore, the method for using the transparent metal oxide as the cathode is limited.
In the prior art, the problem of cathode IR drop can be solved by designing an auxiliary cathode, and mainly an OTI method is adopted, wherein the manufacturing of the auxiliary cathode is realized by adopting a CPM organic material and a modified magnesium metal material. Specifically, the CPM material is evaporated to the light-emitting area through the FMM, the modified magnesium material is evaporated through the Open Mask, and the characteristic that the modified magnesium material and the CPM organic material are mutually repelled is utilized to realize that the modified magnesium material is only attached to the dark area, namely the patterning of the modified magnesium material, 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 affects the light emitting efficiency of the device.
The display panel, the manufacturing method thereof and the display device provided by the application aim to solve the technical problems in the prior art.
The embodiment of the application provides a display panel, as shown in fig. 1, the display panel includes:
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 located at one side of the substrate 1 and including a plurality of anode units 21 located at the light emitting region 10;
a pixel defining layer 3 located on a side of the anode layer 2 away from the substrate 1 and provided with a plurality of pixel openings 31 penetrating 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 unit 21 on the substrate 1;
an organic light emitting layer 4 including a plurality of organic light emitting units, each of the organic light emitting units being located in one of the pixel openings 31;
a cathode layer 5 covering the plurality of pixel openings 31 and the plurality of organic light emitting units;
an auxiliary cathode 6 located on a side of the cathode layer 5 remote from the substrate 1 and having an orthographic projection on the substrate 1 located in a dark region 20;
the patterned covering layer 7 is located on one side of the cathode layer 5 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 located 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 light absorption coefficient, thereby having an effect of improving light transmittance. The patterned coating 7 may be formed using aromatic amines such as triphenylamine, butadiene, styryltrianiline, etc., for example NPB ((N, N '-diphenyl-N, N' - (1-naphthyl) -1,1 '-biphenyl-4, 4' -diamine).
Specifically, in the display panel provided in this embodiment, the material of the cathode layer 5 includes one of magnesium, silver, aluminum or an alloy thereof, and the thickness of the cathode layer 5 is 5nm to 20nm. For example, in one embodiment, the material of the cathode layer 5 is a silver alloy, when designing the thickness of the cathode layer 5, it is necessary to ensure that the transmittance Tr of the cathode layer 5 satisfies Tr (550 nm) >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, aluminum or an alloy thereof, and the thickness of the auxiliary cathode 6 is 1nm to 500nm.
In the display panel provided by the embodiment, the resistance of the cathode layer 5 is reduced by arranging the auxiliary cathode 6, so that the IR drop problem of the cathode is improved; the patterned covering layer 7 is fabricated above the cathode layer 5 and the auxiliary cathode 6, and the patterned covering layer 7 includes a plurality of covering units, and the thickness of the covering units corresponding to the organic light emitting units with different colors is different, so that the light emitting layers with different colors can be ensured to have good light emitting effect, thereby improving the light emitting rate of the display panel.
As shown in fig. 1, in the display panel provided in this embodiment, the 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 cover units include 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; 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, in the display panel provided in this embodiment, the thickness of the first cover unit 100Thickness of the second cover unit 200 +.>Thickness of the third cover unit 300Through 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, specifically, in the display panel provided in the present embodiment, the patterned covering layer 7 includes a common patterned covering layer 7, a first patterned covering layer 7 and a second patterned covering layer 7 on the common patterned covering layer 7; the common patterned cover layer 7 covers the cathode layer 5 and the auxiliary cathode 6, and a portion of the common patterned cover layer 7 located at the blue light emitting unit B is a third cover unit 300, the first patterned cover 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 cover unit 100 includes a portion located at the red light emitting unit R and the first sub-units; the second patterned cover layer 7 comprises a plurality of second sub-units, the orthographic projection of the second sub-units on the substrate 1 covering the orthographic projection of the green light emitting units G on the substrate 1, and the second cover unit 200 comprises a portion located 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 for forming pixel circuits between the substrate 1 and the anode layer 2, which 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, where the display device includes the display panel in the foregoing embodiment, and has the beneficial effects of the display panel in the foregoing embodiment, which is 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 used to provide a driving signal for the display panel, and the power supply is used to provide electric energy for the display panel.
Based on the same inventive concept, the embodiment of the present application provides a method for manufacturing a display panel, as shown in fig. 4 to 9, including:
s1: a substrate 1 is provided, an anode layer 2 is formed on one side of the substrate 1 and the anode layer 2 is patterned to obtain a plurality of anode units 21, the substrate 1 comprises a plurality of light emitting areas 10 and dark areas 20 surrounding the light emitting areas 10, each anode unit 21 is located 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 extending through the pixel defining layer 3, the front projection of the pixel openings 31 onto the substrate 1 being located within the front projection of the anode unit 21 onto 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 pixel opening 31.
S4: the cathode layer 5 is formed, and the cathode layer 5 covers the plurality of pixel openings 31 and the plurality of organic light emitting units. Cathode layer 5 materials of the cathode layer 5 include one of magnesium, silver, aluminum or an alloy thereof, and the thickness of the cathode layer 5 is 5nm to 20nm.
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 region 20. Specifically, the material of the auxiliary cathode 6 includes one of magnesium, silver, aluminum or an alloy thereof, and the thickness of the auxiliary cathode 6 is 1nm to 500nm.
S6: a patterned cover layer 7 is formed, which is located at a side of the cathode layer 5 away from the substrate 1 and comprises a plurality of cover units, the orthographic projection of each light emitting unit on the substrate 1 is located in the orthographic projection of one cover unit on the substrate 1, and the thicknesses of the corresponding cover units of 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. The patterned coating 7 may be formed using aromatic amines such as triphenylamine, butadiene, styryltrianiline, etc., for example NPB ((N, N '-diphenyl-N, N' - (1-naphthyl) -1,1 '-biphenyl-4, 4' -diamine).
According to the manufacturing method of the display panel provided by the embodiment, the resistance of the cathode layer 5 is reduced by arranging the auxiliary cathode 6, so that the IR drop problem of the cathode is improved; the patterned covering layer 7 is fabricated above the cathode layer 5 and the auxiliary cathode 6, and the patterned covering layer 7 includes a plurality of covering units, and the thickness of the covering units corresponding to the organic light emitting units with different colors is different, so that the light emitting layers with different colors can be ensured to have good light emitting effect, thereby improving the light emitting rate of the display panel.
Optionally, as shown in fig. 10 to 12, in the method for manufacturing a display panel provided in this embodiment, step S5 includes:
s501: a first photosensitive material layer m1 is formed on a side of the cathode layer 5 away from the substrate 1, and the first photosensitive material layer m1 is patterned to form a first opening (not labeled in fig. 11) penetrating 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 region 20.
S502: an auxiliary electrode material layer is deposited, covering 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, at the time of peeling off the remaining first photosensitive material layer m1, the auxiliary electrode material layer located thereon is also peeled off.
In this embodiment, the first photosensitive material layer m1 with a thickness greater than that of the auxiliary electrode 6 is manufactured, and the first photosensitive material layer m1 is patterned, so that the auxiliary electrode 6 can be obtained by stripping the remaining first photosensitive material layer m1, and the operation is simple.
Specifically, as shown in fig. 2, the 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 cover units include 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 19, in the method for manufacturing a display panel provided in this embodiment, step S6 includes:
s601: a common cover layer 71 is deposited, the common cover layer 71 covers the cathode layer 5 and the auxiliary cathode 6, and a portion of the common cover layer 71 located in the blue light emitting unit B is the third cover unit 300.
S602: a second photosensitive material layer m2 is formed on a side of the common cover layer 71 remote 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 the second photosensitive material layer m2, and an orthographic projection of the second opening on the substrate 1 is located on an 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: the first capping layer 72 material is deposited, the first capping layer 72 material covers the remaining second photosensitive material layer m2 and the common capping layer 71 at the second opening, and the remaining second photosensitive material layer m2 is stripped to obtain the first capping layer 72, the first capping layer 72 includes a plurality of first sub-units, and the first capping unit 100 includes the common capping layer 71 and the first sub-units on the red light emitting unit R.
S604: forming a third photosensitive material layer m3 on a side of the first cover layer 72 away from the substrate 1, and patterning the third photosensitive material layer m3 to form a third opening (not labeled in fig. 18) penetrating the third photosensitive material layer m3, wherein the orthographic projection of the third opening on the substrate 1 is located in the orthographic projection of the green light emitting unit G on the substrate 1;
s605: the second cover layer 73 material is deposited, the second cover layer 73 material covers the remaining third photosensitive material layer m3 and the common cover layer 71 at the third opening, and the remaining third photosensitive material layer m3 is peeled off to obtain the second cover layer 73, the second cover layer 73 includes a plurality of second sub-units, and the second cover unit 200 includes a portion of the common cover 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 patterning twice, so that the operation is simple.
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 patterning covering layer is manufactured above the cathode layer and the auxiliary cathode, and comprises a plurality of covering units, and the thickness of the covering units corresponding to the organic light-emitting units with different colors is different, so that the light-emitting layers with different colors can have 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 flow, actions, schemes, and alternatives discussed in the present application may be alternated, altered, combined, or eliminated. Further, other steps, means, or steps in a process having various operations, methods, or procedures discussed in this application may be alternated, altered, rearranged, split, combined, or eliminated. Further, steps, measures, schemes in the prior art with various operations, methods, flows disclosed in the present application may also be alternated, altered, rearranged, decomposed, combined, or deleted.
In the description of the present application, it should 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 the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like, 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in 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, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the flowcharts of the figures may include a plurality of sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily being sequential, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
The foregoing is only a partial embodiment of the present application and it should be noted that, for a person skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications should also be considered 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 located at one side of the substrate and including a plurality of anode units located at the light emitting region;
the pixel definition layer is positioned on one side of the anode layer 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 unit 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 in one of the pixel openings;
a cathode layer covering the plurality of pixel openings and the plurality of organic light emitting units;
an auxiliary cathode, which is positioned on one side of the cathode layer far away from the substrate, and the orthographic projection of the auxiliary cathode on the substrate is positioned in the dark area;
the patterning covering layer is positioned on one side of the cathode layer 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.
2. The display panel of claim 1, wherein the display panel comprises,
the organic light emitting unit includes a red light emitting unit, a green light emitting unit, and a blue light emitting unit;
the cover unit comprises a first cover unit positioned on the red light-emitting unit, a second cover unit positioned on the green light-emitting unit and a third cover 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 of claim 2, wherein the display panel comprises,
thickness of the first cover unit
Thickness of the second cover 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 the part of the common cover layer positioned in the blue light emitting unit is a third cover unit,
the first covering layer comprises a plurality of first subunits, the orthographic projection of the first subunits on the substrate covers the orthographic projection of the red light emitting units on the substrate, and the first covering unit comprises a part of the common covering layer and the first subunits which are positioned on the red light emitting units;
the second cover layer comprises a plurality of second sub-units, the orthographic projection of the second sub-units on the substrate covers the orthographic projection of the green light-emitting units on the substrate, and the second cover unit comprises a part of the common cover layer and the second sub-units 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, aluminum or an alloy thereof, and the thickness of the cathode layer is 5nm to 20nm.
6. The display panel according to claim 1, wherein the material of the auxiliary cathode comprises one of magnesium, silver, aluminum or an alloy thereof, and the auxiliary cathode has a thickness of 1nm to 500nm.
7. A display device comprising the display panel of any one of claims 1-6.
8. A method for manufacturing a display panel, comprising:
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 performing patterning treatment on the anode layer to obtain a plurality of anode units positioned in the light-emitting area;
forming a pixel definition layer on the anode layer, and carrying out patterning treatment on the pixel definition layer to form a plurality of pixel openings penetrating through the pixel definition layer, wherein orthographic projection of the pixel openings on the substrate is positioned in orthographic projection of the anode unit on the substrate;
forming an organic light emitting layer including a plurality of organic light emitting units, each of the organic light emitting units being located in one of the pixel openings;
forming a cathode layer covering the plurality of pixel openings and the plurality of organic light emitting units;
forming an auxiliary cathode on the cathode layer, wherein the orthographic projection of the auxiliary cathode on the substrate is positioned in a dark area;
and forming a patterned covering layer, wherein the patterned covering layer is positioned on one side of the cathode layer 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 manufacturing a display panel according to claim 8, wherein the cathode is provided on the cathode layer, comprising:
forming a first photosensitive material layer on one side of the cathode layer away from the substrate, and performing patterning treatment 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 positioned in the dark area;
depositing an auxiliary electrode material layer, wherein the auxiliary electrode material layer covers the rest first photosensitive material layer and the cathode layer at the first opening;
and 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 cover unit comprises a first cover unit positioned on the red light-emitting unit, a second cover unit positioned on the green light-emitting unit and a third cover unit positioned on the blue light-emitting unit;
forming a patterned capping layer comprising:
depositing a common cover layer, wherein the common cover layer covers the cathode layer and the auxiliary cathode, and the part of the common cover layer, which is positioned in the blue light-emitting unit, is a third cover unit;
forming a second photosensitive material layer on one side of the public covering layer far away from the substrate, and carrying out patterning treatment 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 residual second photosensitive material layer and the public cover layer at the second opening, and stripping the residual second photosensitive material layer to obtain the first cover layer, the first cover layer comprises a plurality of first sub-units, and the first cover unit comprises the public cover layer and the first sub-units which are positioned on the red light emitting unit;
forming a third photosensitive material layer on one side of the first covering layer far away from the substrate, and performing patterning treatment on the third photosensitive material layer to form a third opening penetrating through the third photosensitive material layer, wherein the orthographic projection of the third opening on the substrate is positioned in the 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 rest of the third photosensitive material layer and the public cover layer at the third opening, and stripping the rest of the third photosensitive material layer to obtain the second cover layer, the second cover layer comprises a plurality of second sub-units, and the second cover unit comprises a part of the public cover layer and the second sub-units which are positioned on the green light emitting unit.
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| KR20150037278A (en) * | 2013-09-30 | 2015-04-08 | 엘지디스플레이 주식회사 | Large Area Top Emission Organic Light Emitting Diod Display |
| WO2020237919A1 (en) * | 2019-05-28 | 2020-12-03 | 深圳市华星光电半导体显示技术有限公司 | Organic light-emitting diode display apparatus and manufacturing method therefor |
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