Method for roll-to-roll continuous printing of OLED flexible display panel

A flexible display and printing method technology, which is applied in the field of OLED flexible panel preparation, can solve problems such as uneven printing, affecting the large-scale preparation of OLED flexible display panels, and loose bonding, so as to improve transmission efficiency, achieve controllable thickness and The precision is controllable and the effect of overcoming uneven printing

Active Publication Date: 2019-12-31
山西穿越光电科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the defects of uneven printing, easy formation of coffee effect and loose bonding in current inkjet printing, which affect the large-scale production of OLED flexible display panels, the present invention proposes a roll-to-roll continuous printing OLED flexible display panel method, It can overcome the above defects, improve transmission efficiency, realize controllable thickness and precision, and is suitable for preparing large-area OLED flexible display devices

Method used

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  • Method for roll-to-roll continuous printing of OLED flexible display panel
  • Method for roll-to-roll continuous printing of OLED flexible display panel
  • Method for roll-to-roll continuous printing of OLED flexible display panel

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) Feed the roll of polyimide film into the roll-to-roll continuous printing device, firstly by scraping, the polytetrafluoroethylene emulsion with a solid content of 40% dispersed in graphene is scraped on the polyimide film surface, and then pre-dried to make the coating liquid not flow; the mass fraction of graphene in the emulsion is 4%;

[0039] (2) After non-contact inkjet printing, such as figure 1 As shown, the hole injection material ink 2 tetrafluorotetracyanoquinodimethane ink, the hole transport material ink containing silica airgel 1 N,N'-diphenyl-N,N'-(1 -Naphthyl)-1,1'-biphenyl-4,4'-diamine ink is printed on the surface of the anode once alternately, and dried to form a hole transport layer; wherein the mass fraction of silica airgel in the ink is 0.5%;

[0040] (3) After non-contact inkjet printing, red, green, and blue luminescent material inks are printed on the surface of the hole transport layer according to high pixel settings, and dried;

[004...

Embodiment 2

[0045] (1) Feed the roll of polyimide film into the roll-to-roll continuous printing device, firstly by scraping, the polytetrafluoroethylene emulsion with a solid content of 40% dispersed in graphene is scraped on the polyimide film surface, and then pre-dried to make the coating liquid not flow; the mass fraction of graphene in the emulsion is 2%;

[0046] (2) After non-contact inkjet printing, 7,7,8,8-tetracyanoquinodimethane ink, N,N'-diphenyl-N,N containing silica airgel '-Bis(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine ink is printed on the surface of the anode once and dried to form a hole transport layer; the ink contains silicon dioxide The mass fraction of airgel is 0.5%;

[0047] (3) After non-contact inkjet printing, red, green, and blue luminescent material inks are printed on the surface of the hole transport layer according to high pixel settings, and dried;

[0048] (4) Print the yttrium fluoride ink and 4,7-diphenyl-1,10-phenanthroline ink alternately on the ...

Embodiment 3

[0051] (1) Feed the roll of polyimide film into the roll-to-roll continuous printing device, firstly by scraping, the polytetrafluoroethylene emulsion with a solid content of 40% dispersed in graphene is scraped on the polyimide film surface, and then pre-dried to make the coating liquid not flow; the mass fraction of graphene in the emulsion is 3%;

[0052] (2) After non-contact inkjet printing, 4,4',4''-tris(2-naphthylphenylamino)triphenylamine ink, 4,4'-ring containing silica airgel Hexyl bis[N,N-bis(4-methylphenyl)aniline] ink is printed on the surface of the anode in one phase, and dried to form a hole transport layer; the mass fraction of silica airgel in the ink is 0.5% ;

[0053] (3) After non-contact inkjet printing, red, green, and blue luminescent material inks are printed on the surface of the hole transport layer according to high pixel settings, and dried;

[0054] (4) Print zinc oxide ink and 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene ink alternately on ...

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Abstract

The invention provides a method for roll-to-roll continuous printing of an OLED flexible display panel. The method comprises the following steps of coating on anode coating solution containing graphene on a surface of a polyimide film in a roll-to-roll continuous printing device in a blade coating manner; carrying out ink-jet printing on a hole transport material and a hole injection layer material which are alternately distributed on an anode surface; then, carrying out ink-jet printing on a luminescent material, and carrying out ink-jet printing on an electron transport material and an electron injection layer material which are alternately distributed; further laminating with a film deposited with an alloy to form a cathode; and finally carrying out heat setting, packaging and reeling.By using the method of the invention, defects of non-uniform printing, easy formation of a coffee effect and untight combination in direct ink-jet printing are overcome, transmission efficiency is improved, and a controllable thickness and controllable precision are realized. The method is suitable for large-area, large-scale, continuous and stable preparation of the OLED flexible display panel.

Description

technical field [0001] The invention relates to the technical field of preparation of OLED flexible panels, in particular to a roll-to-roll continuous printing method for OLED flexible display panels. Background technique [0002] OLED is an organic light-emitting diode, an organic electroluminescent device with self-luminous properties. Its characteristic is that small organic molecules or polymer materials are used as semiconductors in light-emitting diodes. The structure of its host OLED includes: hole transport layer (HTL), light emitting layer (EL) and electron transport layer (ETL). When the power is supplied to an appropriate voltage, the positive holes and the negative charges will combine in the light-emitting layer to produce light, and the three primary colors of red, green and blue RGB will be generated according to the formula to form the basic color. The characteristic of OLED is that it emits light by itself, unlike TFT LCD which needs backlight, so the visi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/56H01L51/50
CPCH10K71/00H10K71/12H10K71/135H10K50/14
Inventor 曾军堂陈庆
Owner 山西穿越光电科技有限责任公司
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