# US 10,319,301 B2 · OLED display device and manufacture method thereof

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- Number: US 10,319,301 B2
- Document ID: US10319301B2
- Status: Granted
- Kind: B2
- Application number: 15/505,105
- Filed: 2016-12-30
- Published: 2018-08-09
- Granted: 2019-06-11
- Earliest claimed: 2016-12-27
- Assignees: Wuhan China Star Optoelectronics Technology Co., Ltd.
- Applicants: Wuhan China Star Optoelectronics Technology Co., Ltd.
- Inventors: Jinming Tang
- Web page: https://patentgrep.com/patent/US10319301B2

## CPC

- H10K 59/35: comprising red-green-blue [RGB] subpixels
- G09G 3/3241: the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 50/13: comprising stacked EL layers within one EL unit
- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 59/1315: {comprising structures specially adapted for lowering the resistance}
- H10K 59/352: {the areas of the RGB subpixels being different}
- H10K 59/353: {characterised by the geometrical arrangement of the RGB subpixels}
- H10K 59/80518: {Reflective anodes, e.g. ITO combined with thick metallic layers}
- H10K 59/876: {comprising a resonant cavity structure, e.g. Bragg reflector pair}
- H10K 71/164: {using vacuum deposition}
- H10K 85/1135: {Polyethylene dioxythiophene [PEDOT]; Derivatives thereof}
- H10K 85/342: {comprising iridium}
- H10K 85/631: {Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine}
- H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole}
- H10K 2101/10: Triplet emission
- H10K 2101/40: Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
- H10K 2102/351: {Thickness}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

The present invention provides an OLED display device and a manufacture method thereof. By respectively configuring the first, second, third PEDOT:PSS conductive film layers in the red, green, blue OLED elements, and setting the first, second, third PEDOT:PSS conductive film layers conductive film layers to have various thicknesses to realize that the luminous efficiencies of the red, green, blue OLED elements respectively achieve the best, and all the first, second, third PEDOT:PSS conductive film layers are manufactured by the ink jet printing method. In comparison with the traditional OLED display device, the thicknesses of the first hole transporting layer, the second hole transporting layer, the third hole transporting layer in the red, green, blue OLED elements are the same in the OLED display device of the present invention, thus they can be formed in the same evaporation process with one common metal mask to eliminate three fine metal masks.

## Claims

### Claim 1

An OLED display device, comprising a substrate, a pixel definition layer located on the substrate, a plurality of through holes located in the pixel definition layer, and a plurality of red OLED elements, a plurality of green OLED elements and a plurality of blue OLED elements, which are respectively located in the plurality of through holes;
the red OLED element comprising a first transparent conductive metal oxide layer, a first metal layer, a first PEDOT:PSS Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)) conductive film layer, a second transparent conductive metal oxide layer, a first hole injection layer, a first hole transporting layer, a red light emitting layer, a first electron transporting layer and a first cathode on the substrate from bottom to top in order; the first transparent conductive metal oxide layer, the first metal layer, the first PEDOT:PSS conductive film layer and the second transparent conductive metal oxide layer constituting a first anode, together;
the green OLED element comprising a third transparent conductive metal oxide layer, a second metal layer, a second PEDOT:PSS conductive film layer, a fourth transparent conductive metal oxide layer, a second hole injection layer, a second hole transporting layer, a green light emitting layer, a second electron transporting layer and a second cathode on the substrate from bottom to top in order; the third transparent conductive metal oxide layer, the second metal layer, the second PEDOT:PSS conductive film layer and the fourth transparent conductive metal oxide layer constituting a second anode, together;
the blue OLED element comprising a fifth transparent conductive metal oxide layer, a third metal layer, a third PEDOT:PSS conductive film layer, a sixth transparent conductive metal oxide layer, a third hole injection layer, a third hole transporting layer, a blue light emitting layer, a third electron transporting layer and a third cathode on the substrate from bottom to top in order; the fifth transparent conductive metal oxide layer, the third metal layer, the third PEDOT:PSS conductive film layer and the sixth transparent conductive metal oxide layer constituting a third anode, together;
wherein materials of the first transparent conductive metal oxide layer, the second transparent conductive metal oxide layer, the third transparent conductive metal oxide layer, the fourth transparent conductive metal oxide layer, the fifth transparent conductive metal oxide layer, the sixth transparent conductive metal oxide layer are tin indium oxide, and materials of the first metal layer, the second metal layer, the third metal layer are silver;
materials of the first cathode, the second cathode, the third cathode are the same, and comprise at least one of low work function metal, alloy formed by low work function metal and at least one of copper, gold, and silver, low work function metal nitride and low work function metal fluoride; the low work function metal comprises at least one of lithium, magnesium, calcium, strontium, aluminum and indium;
materials of the first hole injection layer, the second hole injection layer, the third hole injection layer comprise HAT(CN)6, and a constitutional formula of HAT(CN)6 is
materials of the first electron transporting layer, the second electron transporting layer, the third electron transporting layer are the same, and comprise BPhen, and a constitutional formula of BPhen is

### Claim 2 (depends on 1)

The OLED display device according to claim 1, wherein materials of the first PEDOT:PSS conductive film layer, the second PEDOT:PSS conductive film layer, the third PEDOT:PSS conductive film layer are the same, and a refractive index thereof is ηp, and materials of the second transparent conductive metal oxide layer, the fourth transparent conductive metal oxide layer, the sixth transparent conductive metal oxide layer are the same, and a refractive index thereof is ηI, and materials of the first hole injection layer, the second hole injection layer, the third hole injection layer are the same, and a refractive index thereof is ηJ, and materials of the first hole transporting layer, the second hole transporting layer, the third hole transporting layer are the same, and a refractive index thereof is ηT, and a peak wavelength of red light emitted by the red light emitting layer is λR, and a peak wavelength of green light emitted by the green light emitting layer is λG, and a peak wavelength of blue light emitted by the blue light emitting layer is λB;
a thickness of the first PEDOT:PSS conductive film layer is defined to be dRP, and a thickness of the second transparent conductive metal oxide layer is defined to be dRI, and a thickness of the first hole injection layer is defined to be dRJ, and a thickness of the first hole transporting layer is defined to be dRT, and a relation of dRP, dRI, dRJ, dRT satisfies a relationship:
ηP*dRP+ηI*dRI+ηJ*dRJ+ηT*dRT=(2mR+1)λR/4;
wherein mR is a natural number;
a thickness of the second PEDOT:PSS conductive film layer is defined to be dGP, and a thickness of the fourth transparent conductive metal oxide layer is defined to be dGI, and a thickness of the second hole injection layer is defined to be dGJ, and a thickness of the second hole transporting layer is defined to be dGT, and a relation of dGP, dGI, dGJ, dGT satisfies a relationship:
ηP*dGP+ηI*dGI+ηJ*dGJ+ηT*dGT=(2mG+1)λG/4;
wherein mG is a natural number;
a thickness of the third PEDOT:PSS conductive film layer is defined to be dBP, and a thickness of the sixth transparent conductive metal oxide layer is defined to be dBI, and a thickness of the third hole injection layer is defined to be dBJ, and a thickness of the third hole transporting layer is defined to be dBT, and a relation of dBP, dBI, dBJ, dBT satisfies a relationship:
ηP*dBP+ηI*dBI+ηJ*dBJ+ηT*dBT=(2mB+1)λB/4;
wherein mB is a natural number;
and dRI=dGI=dBI, dRJ=dGJ=dBJ, dRT=dGT=dBT, mR=mG=mB,and λR, λG, λBare unequal, and thus, dRP, dGP, dBP are unequal.

### Claim 3 (depends on 1)

The OLED display device according to claim 1, wherein the plurality of through holes in the pixel definition layer appear to be tapered, and a dimension of the through hole gradually increases from one end away from the substrate to one end close to the substrate.

### Claim 4 (depends on 1)

The OLED display device according to claim 1, wherein the red light emitting layer comprises a main material and a doped dye, and the main material is CBP, and the doped dye is red phosphorescent dye, and the red phosphorescent dye is Ir(DBQ)2(acac);
the green light emitting layer comprises a main material and a doped dye, and the main material is CBP, and the doped dye is green phosphorescent dye, and the green phosphorescent dye is Ir(ppy)3;
the blue light emitting layer comprises a main material and a doped dye, and the main material is AND, and the doped dye is blue fluorescent dye, and the blue fluorescent dye is BUBD-1;
a constitutional formula of CBP is
a constitutional formula of Ir(DBQ)2(acac) is
a constitutional formula of Ir(ppy)3 is
a constitutional formula of BUBD-1 is

### Claim 5

A manufacture method of an OLED display device, comprising steps of:
step 1, providing a substrate, and forming a pixel definition layer on the substrate, and configuring a plurality of through holes which are separately located in the pixel definition layer, and the plurality of through holes defining a plurality of red pixel regions, a plurality of green pixel regions and a plurality of blue pixel regions on the substrate;
respectively forming a first transparent conductive metal oxide layer, a third transparent conductive metal oxide layer, a fifth transparent conductive metal oxide layer in the red pixel region, the green pixel region and the blue pixel region of the substrate;
respectively forming a first metal layer, a second metal layer, a third metal layer on the first transparent conductive metal oxide layer, the third transparent conductive metal oxide layer, the fifth transparent conductive metal oxide layer;
respectively coating PEDOT:PSS (Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)) aqueous solution on the first metal layer, the second metal layer and the third metal layer, and forming a first PEDOT:PSS conductive film layer, a second PEDOT:PSS conductive film layer, a third PEDOT:PSS conductive film layer after curing and removing moisture;
respectively depositing a second transparent conductive metal oxide layer, a fourth transparent conductive metal oxide layer, a sixth transparent conductive metal oxide layer on the first PEDOT:PSS conductive film layer, the second PEDOT:PSS conductive film layer, the third PEDOT:PSS conductive film layer;
in the red pixel region, the first transparent conductive metal oxide layer, the first metal layer, the first PEDOT:PSS conductive film layer and the second transparent conductive metal oxide layer which are stacked up from bottom to top in order constituting a first anode, together;
in the green pixel region, the third transparent conductive metal oxide layer, the second metal layer, the second PEDOT:PSS conductive film layer and the fourth transparent conductive metal oxide layer which are stacked up from bottom to top in order constituting a second anode, together;
in the blue pixel region, the fifth transparent conductive metal oxide layer, the third metal layer, the third PEDOT:PSS conductive film layer and the sixth transparent conductive metal oxide layer which are stacked up from bottom to top in order constituting a third anode, together;
step 2, cleaning the first anode, the second anode and the third anode;
step 3, respectively evaporating a first hole injection layer, a second hole injection layer, a third hole injection layer on the first anode, the second anode and the third anode in the same evaporation process;
respectively evaporating a first hole transporting layer, a second hole transporting layer, a third hole transporting layer on the first hole injection layer, the second hole injection layer, the third hole injection layer in the same evaporation process;
respectively evaporating a red light emitting layer, a green light emitting layer, a blue light emitting layer on the first hole transporting layer, the second hole transporting layer, the third hole transporting layer in three different evaporation processes;
respectively evaporating a first electron transporting layer, a second electron transporting layer, a third electron transporting layer on the red light emitting layer, the green light emitting layer, the blue light emitting layer in the same evaporation process;
respectively evaporating a first cathode, a second cathode, a third cathode on the first electron transporting layer, the second electron transporting layer, the third electron transporting layer in the same evaporation process;
and forming red OLED elements, green OLED elements and blue OLED elements respectively corresponding to the red pixel regions, the green pixel regions, the blue pixel regions in the plurality of through holes of the pixel definition layer;
wherein materials of the first PEDOT:PSS conductive film layer, the second PEDOT:PSS conductive film layer, the third PEDOT:PSS conductive film layer are the same, and a refractive index thereof is ηP, and materials of the second transparent conductive metal oxide layer, the fourth transparent conductive metal oxide layer, the sixth transparent conductive metal oxide layer are the same, and a refractive index thereof is ηI, and materials of the first hole injection layer, the second hole injection layer, the third hole injection layer are the same, and a refractive index thereof is ηJ, and materials of the first hole transporting layer, the second hole transporting layer, the third hole transporting layer are the same, and a refractive index thereof is ηT, and a peak wavelength of red light emitted by the red light emitting layer is λR, and a peak wavelength of green light emitted by the green light emitting layer is λG, and a peak wavelength of blue light emitted by the blue light emitting layer is λB;
a thickness of the first PEDOT:PSS conductive film layer is defined to be dRP, and a thickness of the second transparent conductive metal oxide layer is defined to be dRI, and a thickness of the first hole injection layer is defined to be dRJ, and a thickness of the first hole transporting layer is defined to be dRT, and a relation of dRP, dRI, dRJ, dRT satisfies a relationship:
ηP*dRP+ηI*dRI+ηJ*dRJ+ηT*dRT=(2mR+1)λR/4;
wherein mR is a natural number;
a thickness of the second PEDOT:PSS conductive film layer is defined to be dGP, and a thickness of the fourth transparent conductive metal oxide layer is defined to be dGI, and a thickness of the second hole injection layer is defined to be dGJ, and a thickness of the second hole transporting layer is defined to be dGT, and a relation of dGP, dGI, dGT satisfies a relationship:
ηP*dGP+ηI*dGI+ηGJ*dGJ+ηT*dGT+(2mG+1)λG/4;
wherein mG is a natural number;
a thickness of the third PEDOT:PSS conductive film layer is defined to be dBP, and a thickness of the sixth transparent conductive metal oxide layer is defined to be dBI, and a thickness of the third hole injection layer is defined to be dBJ, and a thickness of the third hole transporting layer is defined to be dBT, and a relation of dBP, dBI, dBJ, dBT satisfies a relationship:
ηP*dBP+ηI*dBI+ηJ*dBJ+ηT*dBT=(2mB+1)λB/4;
wherein mB is a natural number;
and dRI=dGI=dBI, dRJ=dGJ=dBJ, dRT=dGT=dBT, mR=mG=mB, and λR, λG, λB are unequal, and thus, dRP, dGP, dBP are unequal.

### Claim 6 (depends on 5)

The manufacture method of the OLED display device according to claim 5, wherein the plurality of through holes in the pixel definition layer appear to be tapered, and a dimension of the through hole gradually increases from one end away from the substrate to one end close to the substrate.

### Claim 7 (depends on 5)

The manufacture method of the OLED display device according to claim 5, wherein;
in step 1, a magnetron sputtering method is used to deposit the first transparent conductive metal oxide layer, the second transparent conductive metal oxide layer, the third transparent conductive metal oxide layer, the fourth transparent conductive metal oxide layer, the fifth transparent conductive metal oxide layer, the sixth transparent conductive metal oxide layer, and the first metal layer, the second metal layer, the third metal layer are silver;
an ink jet printing method is used to respectively coat PEDOT:PSS aqueous solution on the first metal layer, the second metal layer and the third metal layer.

### Claim 8 (depends on 5)

The manufacture method of the OLED display device according to claim 5, wherein the red light emitting layer comprises a main material and a doped dye, and the main material is CBP, and the doped dye is red phosphorescent dye, and the red phosphorescent dye is Ir(DBQ)2(acac);
the green light emitting layer comprises a main material and a doped dye, and the main material is CBP, and the doped dye is green phosphorescent dye, and the green phosphorescent dye is Ir(ppy)3;
the blue light emitting layer comprises a main material and a doped dye, and the main material is AND, and the doped dye is blue fluorescent dye, and the blue fluorescent dye is BUBD-1;
a constitutional formula of CBP is
a constitutional formula of Ir(DBQ)2(acac) is
a constitutional formula of Ir(ppy)3 is
a constitutional formula of BUBD-1 is

### Claim 9

A manufacture method of an OLED display device, comprising steps of:
step 1, providing a substrate, and forming a pixel definition layer on the substrate, and configuring a plurality of through holes which are separately located in the pixel definition layer, and the plurality of through holes defining a plurality of red pixel regions, a plurality of green pixel regions and a plurality of blue pixel regions on the substrate;
respectively forming a first transparent conductive metal oxide layer, a third transparent conductive metal oxide layer, a fifth transparent conductive metal oxide layer in the red pixel region, the green pixel region and the blue pixel region of the substrate;
respectively forming a first metal layer, a second metal layer, a third metal layer on the first transparent conductive metal oxide layer, the third transparent conductive metal oxide layer, the fifth transparent conductive metal oxide layer;
respectively coating PEDOT:PSS (Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)) aqueous solution on the first metal layer, the second metal layer and the third metal layer, and forming a first PEDOT:PSS conductive film layer, a second PEDOT:PSS conductive film layer, a third PEDOT:PSS conductive film layer after curing and removing moisture;
respectively depositing a second transparent conductive metal oxide layer, a fourth transparent conductive metal oxide layer, a sixth transparent conductive metal oxide layer on the first PEDOT:PSS conductive film layer, the second PEDOT:PSS conductive film layer, the third PEDOT:PSS conductive film layer;
in the red pixel region, the first transparent conductive metal oxide layer, the first metal layer, the first PEDOT:PSS conductive film layer and the second transparent conductive metal oxide layer which are stacked up from bottom to top in order constituting a first anode, together;
in the green pixel region, the third transparent conductive metal oxide layer, the second metal layer, the second PEDOT:PSS conductive film layer and the fourth transparent conductive metal oxide layer which are stacked up from bottom to top in order constituting a second anode, together;
in the blue pixel region, the fifth transparent conductive metal oxide layer, the third metal layer, the third PEDOT:PSS conductive film layer and the sixth transparent conductive metal oxide layer which are stacked up from bottom to top in order constituting a third anode, together;
step 2, cleaning the first anode, the second anode and the third anode;
step 3, respectively evaporating a first hole injection layer, a second hole injection layer, a third hole injection layer on the first anode, the second anode and the third anode in the same evaporation process;
respectively evaporating a first hole transporting layer, a second hole transporting layer, a third hole transporting layer on the first hole injection layer, the second hole injection layer, the third hole injection layer in the same evaporation process;
respectively evaporating a red light emitting layer, a green light emitting layer, a blue light emitting layer on the first hole transporting layer, the second hole transporting layer, the third hole transporting layer in three different evaporation processes;
respectively evaporating a first electron transporting layer, a second electron transporting layer, a third electron transporting layer on the red light emitting layer, the green light emitting layer, the blue light emitting layer in the same evaporation process;
respectively evaporating a first cathode, a second cathode, a third cathode on the first electron transporting layer, the second electron transporting layer, the third electron transporting layer in the same evaporation process;
and forming red OLED elements, green OLED elements and blue OLED elements respectively corresponding to the red pixel regions, the green pixel regions, the blue pixel regions in the plurality of through holes of the pixel definition layer;
wherein materials of the first PEDOT:PSS conductive film layer, the second PEDOT:PSS conductive film layer, the third PEDOT:PSS conductive film layer are the same, and a refractive index thereof is ηP, and materials of the second transparent conductive metal oxide layer, the fourth transparent conductive metal oxide layer, the sixth transparent conductive metal oxide layer are the same, and a refractive index thereof is ηI, and materials of the first hole injection layer, the second hole injection layer, the third hole injection layer are the same, and a refractive index thereof is ηJ, and materials of the first hole transporting layer, the second hole transporting layer, the third hole transporting layer are the same, and a refractive index thereof is ηT, and a peak wavelength of red light emitted by the red light emitting layer is λR, and a peak wavelength of green light emitted by the green light emitting layer is λG, and a peak wavelength of blue light emitted by the blue light emitting layer is λB;
a thickness of the first PEDOT:PSS conductive film layer is defined to be dRP, and a thickness of the second transparent conductive metal oxide layer is defined to be dRI, and a thickness of the first hole injection layer is defined to be dRJ, and a thickness of the first hole transporting layer is defined to be dRT, and a relation of dRP, dRI, dRJ, dRT satisfies a relationship:
ηRP*dRP+ηRI*dRI+ηJ*dRJ+ηT*dRT=(2mR+1)λR/4;
wherein mR is a natural number;
a thickness of the second PEDOT:PSS conductive film layer is defined to be dGP, and a thickness of the fourth transparent conductive metal oxide layer is defined to be dGI, and a thickness of the second hole injection layer is defined to be dGJ, and a thickness of the second hole transporting layer is defined to be dGT, and a relation of dGP, dGI, dGJ, dGT satisfies a relationship:
ηP*dGP+ηI*dGI+ηJ*dGJ+ηT*dGT=(2mG+1)λG/4;
wherein mG is a natural number;
a thickness of the third PEDOT:PSS conductive film layer is defined to be dBP, and a thickness of the sixth transparent conductive metal oxide layer is defined to be dBI, and a thickness of the third hole injection layer is defined to be dBJ, and a thickness of the third hole transporting layer is defined to be dBT, and a relation of dBP, dBI, dBJ, dBT satisfies a relationship:
ηP*dBP+ηI*dBI+ηJ*dBJ+ηT*dBT=(2mB+1)λB/4;
wherein mB is a natural number;
and dRI=dGI=dBI, dRJ=dGJ=dBJ, dRT=dGT=dBT, mR=mG=mB, and λR, λG, λB are unequal, and thus, dRP, dGP, dBP are unequal;
wherein the plurality of through holes in the pixel definition layer appear to be tapered, and a dimension of the through hole gradually increases from one end away from the substrate to one end close to the substrate;
wherein the red light emitting layer comprises a main material and a doped dye, and the main material is CBP, and the doped dye is red phosphorescent dye, and the red phosphorescent dye is Ir(DBQ)2(acac);
the green light emitting layer comprises a main material and a doped dye, and the main material is CBP, and the doped dye is green phosphorescent dye, and the green phosphorescent dye is Ir(ppy)3;
the blue light emitting layer comprises a main material and a doped dye, and the main material is AND, and the doped dye is blue fluorescent dye, and the blue fluorescent dye is BUBD-1;
a constitutional formula of CBP is
a constitutional formula of Ir(DBQ)2(acac) is
a constitutional formula of Ir(ppy)3 is
a constitutional formula of BUBD-1 is

### Claim 10 (depends on 9)

The manufacture method of the OLED display device according to claim 9, wherein;
in step 1, a magnetron sputtering method is used to deposit the first transparent conductive metal oxide layer, the second transparent conductive metal oxide layer, the third transparent conductive metal oxide layer, the fourth transparent conductive metal oxide layer, the fifth transparent conductive metal oxide layer, the sixth transparent conductive metal oxide layer, and the first metal layer, the second metal layer, the third metal layer are silver;
an ink jet printing method is used to respectively coat PEDOT:PSS aqueous solution on the first metal layer, the second metal layer and the third metal layer.