Preparation method of printed display device

Abstract

The present invention relates to a method for preparing a printed display device, comprising the following steps: S1, depositing a first electrode layer on a substrate; S2, preparing a pixel defining layer on the first electrode layer and forming a pixel pit; S3, Inkjet printing the functional layer ink in the pixel pit, and then placing it in the saturated steam atmosphere of the second solvent for steam treatment, the functional layer ink includes the functional layer material and the first solvent; the device after the steam treatment is placed at room temperature Conditions, natural drying in air or nitrogen environment; then heat treatment to form a functional layer; S4, depositing an electron transport layer and a second electrode layer on the functional layer, and packaging to obtain the printed display device. The preparation method of the above-mentioned printed display can improve the wettability of the ink and the pixel bank, so that the uniform film formation of the ink in the entire pixel area can effectively suppress the generation of leakage current.

Description

technical field [0001] The invention relates to the technical field of display devices, in particular to a method for preparing a printed display device. Background technique [0002] Solution processing technology has good development prospects because it does not require expensive vacuum equipment and can realize low-cost, large-area, large-scale, and high-efficiency production of OLED and QLED displays. Among them, the inkjet printing technology not only realizes the colorization of the display screen without a mask by selectively depositing functional inks in the corresponding pixels, but also greatly improves the utilization rate of materials, and is considered to be the most capable of promoting large-scale printing. Patterned film-forming technology for the industrialization of large-area flexible full-color displays. In all solution processing and film forming processes, a process of desolventization and drying to form a film is required, which determines the qualit...

AI Technical Summary

Problems solved by technology

However, the realization of such a pixel-defining layer with sub-regional hydrophilic and hydrophobic characteristics often requires repeated alignment, exposure, development and etching processes for various materials, which is difficult to produce, complicated in process, and high in preparation costs.

At the same time, the hydrophilic treatment of the bottom of the pixel definition layer will also increase the pinning effect of the contact line on the edge of the pixel definition layer during the droplet drying process, which will intensify the formation of "coffee rings", and it is difficult to ensure the uniformity of the film in the pixel

These problems have limited the industrialization progress of inkjet printing to prepare displays to a certain extent.

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