Preparation method of printed display device

Abstract

The invention relates to a preparation method of a printed display device. The preparation method comprises the following steps of S1, depositing a first electrode layer on a substrate; S2, preparing a pixel definition layer on the first electrode layer and forming pixel pits; S3, performing ink-jet printing of functional layer ink in the pixel pints, and then putting into a saturated vapor atmosphere of a second solvent to perform vapor treatment, wherein the functional layer ink comprises a functional layer material and a first solvent; putting the device after vapor treatment into a room temperature condition, and naturally drying in air or nitrogen environment; and next, performing heat treatment to form a functional layer; and S4, depositing an electron transfer layer and a second electrode layer on the functional layer, and performing packaging to obtain the printed display device. By virtue of the preparation method of the printed display device, the wettability of ink and pixel Bank can be improved, so that the ink can be subjected to uniform film forming in the whole pixel region, and generation of electric leakage can be suppressed effectively.

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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