An organic material transfer printing method in an organic light-emitting display

Abstract

An organic material transfer printing method in an organic light-emitting display is disclosed. The method includes following steps of: 1) positioning a substrate on a fixed platform; 2) tightly attaching a film mask onto the substrate and positioning the film mask on the fixed platform; 3) evenly arranging a liquid organic material onto the wheel surface of an idler wheel; 4) subjecting the organic material to transfer printing onto the substrate by rotation and movement of the idler wheel; 5) removing water in the organic material subjected to transfer printing on the substrate to turn the organic material into a solid state; and 6) when a monochromatic device structure is produced, repeating the step 3) to the step 5) so that the organic material is subjected to transfer printing on the substrate layer by layer; and when a multicolor or color device structure is produced, changing the film mask according to an organic material to be subjected to transfer printing and subjecting the organic material to transfer printing to the substrate layer by layer. The film mask used in the method can improve processing precision of the organic light-emitting display. When being used for production of large-size OLED screens and large-size substrates, the method can ensure OLED screens to be free of abnormity and ensure product quality.

Description

technical field [0001] The invention relates to the technical field of organic light emitting display manufacturing, in particular to an organic material transfer printing method on an organic light emitting display. Background technique [0002] In the production process of organic light-emitting display (OLED, Organic Light-Emitting Diode screen body), the evaporation method is generally used at present. During evaporation, a mask (MASK) with a certain graphic shape needs to be produced first. The traditional MASK It is made of stainless steel, and the MASK is fixed on the support frame by stretching technology and welding technology to form a whole metal MASK, and then evaporated in the graphics surrounded by the metal MASK. [0003] For example, Chinese patent document CN102021517 discloses a screen-type evaporation source and evaporation method in the OLED preparation process, which includes a vacuum chamber and a heat source placed in the vacuum chamber from top to bot...

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Problems solved by technology

[0004] For this reason, the technical problem to be solved by the present invention is that the existing methods of manufacturing organic light-emitting displays by evaporation are only suitable for manufacturing small-sized OLED screens, and in the production of some OLEDs with larger sizes or larger substrates, The metal mask plate is prone to deformation, resulting in abnormalities in the produced OLED products, high defective rate, and serious waste

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