Oled color display device

Patent metadata

Field	Value
Publication number	US-2016307977-A1
Application number	US-201514655720-A
Country	US
Kind code	A1
Filing date	Apr 1, 2015
Priority date	Jan 21, 2015
Publication date	Oct 20, 2016
Grant date	—

Abstract

The present invention provides an OLED color display device, comprising a substrate ( 1 ), an anode ( 11 ), a thin film transistor array ( 21 ), a Hole Injection Layer ( 22 ), a Hole Transport Layer ( 23 ), a light emitting layer ( 3 ), an Electron Transport Layer ( 24 ), a cathode ( 12 ), a package cover plate ( 2 ), a color conversion layer ( 4 ) and a seal frame ( 5 ); the light emitting layer ( 3 ) comprises a first light emitting layer ( 31 ) and the second light emitting layer ( 32 ), and both the first light emitting layer ( 31 ) and the second light emitting layer ( 32 ) are manufactured by host material doped with guest material, and the guest material comprises luminescent material and electron transport material; the first light emitting layer ( 31 ) is a blue light emitting layer, and the second light emitting layer ( 32 ) is a red, green lights commonly emitting layer, a yellow light emitting layer or a green light emitting layer; lights emitted by the first light emitting layer ( 31 ) and the second light emitting layer ( 32 ) synthesize white light or blue, green light possessing higher energy efficiency and luminescence efficiency. The power consumption is low.

First claim

What is claimed is:

1 . An OLED color display device, comprising a substrate, an anode formed on the substrate, a thin film transistor array formed on the anode, a Hole Injection Layer formed on the thin film transistor array, a Hole Transport Layer formed on the Hole Injection Layer, a light emitting layer formed on the Hole Transport Layer, an Electron Transport Layer formed on the light emitting layer, a cathode formed on the Electron Transport Layer, a package cover plate formed on the cathode and laminated with the substrate, a color conversion layer formed at an inner side of the package cover plate and a seal frame adhering the substrate and the package cover plate;
the light emitting layer comprises a first light emitting layer and a second light emitting layer, and both the first light emitting layer and the second light emitting layer are manufactured by host material doped with guest material, and the guest material comprises luminescent material and electron transport material; the first light emitting layer is a blue light emitting layer, and the second light emitting layer is a red, green lights commonly emitting layer, a yellow light emitting layer or a green light emitting layer; lights emitted by the first light emitting layer and the second light emitting layer synthesize white light or blue, green light; the color conversion layer comprises a blue light filter unit, a green light filter unit and a red light conversion unit which are located in intervals; the white light or the blue, green light is filtered by the blue light filter unit to be blue light, and is filtered by the green light filter unit to be green light, and is converted by the red light conversion unit to be red light to achieve color display.

2 . The OLED color display device according to claim 1 , wherein a ratio of the host material and the guest material is 8:1-20:1, and a ratio of the luminescent material and the electron transport material in the guest material is 1:1-10:1.

3 . The OLED color display device according to claim 1 , wherein the color conversion layer further comprises a blank transmission unit, and the white light or the blue, green light remains to be the white light or the blue, green light after penetrating the blank transmission unit.

4 . The OLED color display device according to claim 2 , wherein in the first light emitting layer, the host material is organic blue light host material, and the luminescent material and the electron transport material in the guest material respectively are blue fluorescence dopant and electron transport dopant; in the second light emitting layer, the host material is organic blue light host material or organic green light host material, and the luminescent material and the electron transport material in the guest material respectively are phosphorescence dopant and electron transport dopant.

5 . The OLED color display device according to claim 4 , wherein the phosphorescence dopant is red, green phosphorescence co dopant or yellow phosphorescence dopant to synthesize the blue fluorescence emitted by the first light emitting layer and the red, green phosphorescence or the yellow phosphorescence emitted by the second light emitting layer to be white light; or the phosphorescence dopant is green phosphorescence to synthesize the blue fluorescence emitted by the first light emitting layer and the green phosphorescence emitted by the second light emitting layer to be blue, green light.

6 . The OLED color display device according to claim 1 , wherein the light emitting layer further comprises a separation layer between the first light emitting layer and the second light emitting layer, and the separation layer is constituted by the host material doped with the electron transport material, and the host material is organic blue light host material or organic green light host material.

7 . The OLED color display device according to claim 1 , wherein material of the substrate and the package cover plate is glass or flexible material, and at least one of the substrate and the package cover plate is transparent.

8 . The OLED color display device according to claim 5 , wherein the blue light host material is 4,4′,4″-Tris(carbazol-9-yl)-triphenylamine or 2,4,6-Tri(9H-carbazol-9-yl)-1,3,5-triazine; the green light host material is 3,3′-(1,3 phenyl)Bis(7-Ethoxy-4-methylcoumarin); the blue fluorescence dopant is polyfluorene, 4,4′-Bis(2,2-diphenylvinyl)biphenyl or FIr6; the red, green phosphorescence co dopant comprises red phosphorescence dopant and green phosphorescence dopant; the red phosphorescence dopant is Tris[1-phenylisoquinolinato-C2,N]iridium(III); the green phosphorescence dopant is Tris(2-phenylpyridine)iridium; the yellow phosphorescence dopant is Bis(2,3-diphenylpyrazine)-(Acetylacetonato)iridium; the Electron Transport dopant is 2-(4-tert-Butylphenyl)-5-(4-biphenyl)-1,3,4-oxadiazole.

9 . The OLED color display device according to claim 1 , wherein the light emitting layer is formed by thermal evaporation or solution film formation.

10 . The OLED color display device according to claim 1 , wherein material of the Electron Transport Layer is 8-Hydroxyquinoline aluminum salt and material of the Hole Transport Layer is poly-TPD.

11 . An OLED color display device, comprising a substrate, an anode formed on the substrate, a thin film transistor array formed on the anode, a Hole Injection Layer formed on the thin film transistor array, a Hole Transport Layer formed on the Hole Injection Layer, a light emitting layer formed on the Hole Transport Layer, an Electron Transport Layer formed on the light emitting layer, a cathode formed on the Electron Transport Layer, a package cover plate formed on the cathode and laminated with the substrate, a color conversion layer formed at an inner side of the package cover plate and a seal frame adhering the substrate and the package cover plate;
the light emitting layer comprises a first light emitting layer and a second light emitting layer, and both the first light emitting layer and the second light emitting layer are manufactured by host material doped with guest material, and the guest material comprises luminescent material and electron transport material; the first light emitting layer is a blue light emitting layer, and the second light emitting layer is a red, green lights commonly emitting layer, a yellow light emitting layer or a green light emitting layer; lights emitted by the first light emitting layer and the second light emitting layer synthesize white light or blue, green light; the color conversion layer comprises a blue light filter unit, a green light filter unit and a red light conversion unit which are located in intervals; the white light or the blue, green light is filtered by the blue light filter unit to be blue light, and is filtered by the green light filter unit to be green light, and is converted by the red light conversion unit to be red light to achieve color display; a ratio of the host material and the guest material is 8:1-20:1, and a ratio of the luminescent material and the electron transport material in the guest material is 1:1-10:1; the color conversion layer further comprises a blank transmission unit, and the white light or the blue, green light remains to be the white light or the blue, green light after penetrating the blank transmission unit; the light emitting layer further comprises a separation layer between the first light emitting layer and the second light emitting layer, and the separation layer is constituted by the host material doped with the electron transport material, and the host material is organic blue light host material or organic green light host material; where

Assignees

• Shenzhen China Star Optoelect

Inventors

• Liu Yawei
• Wang Yifan

Classifications

• H10K59/871

  Self-supporting sealing arrangements · CPC title

• H10K59/1213

  the pixel elements being TFTs · CPC title

• H10D86/40 Primary

  characterised by multiple TFTs · CPC title

• H10D86/60

  wherein the TFTs are in active matrices · CPC title

• H01L2251/5376

  Electricity · mapped topic