A piezoelectric control system and method for printing and preparing high-uniform device film layers

Abstract

The invention discloses a piezoelectric control system and method for printing and preparing a high-uniform device film layer. The system includes: a central control device, a main piezoelectric injection device and an ink adjustment device, a main piezoelectric injection device, and an ink adjustment device They are respectively connected to the central control device; the central control device is equipped with a main controller and a piezoelectric drive device, the main controller is used to generate and transmit printing instructions to control the printing process of ink and electric nozzles, and the piezoelectric drive device is used to drive the main pressure The electrospray device; the ink adjustment device is provided with a first liquid dispensing device and a second liquid dispensing device, and the first liquid dispensing device and the second liquid dispensing device adjust the delivery rate of the solvent and set the total flow to maintain a constant value. The present invention controls the solvent volatilization of ink droplets sprayed in different time periods by changing the delivery volume of the first solvent and the second solvent respectively through the first liquid distributing device and the second liquid dispensing device, so that the ink droplets sprayed before and after show a difference in boiling point gradient, The technical effect of further improving the uniformity of film formation.

Description

technical field [0001] The invention relates to the technical field of printed electronics, in particular to a piezoelectric control system and method for printing and preparing high-uniform device film layers. Background technique [0002] With the rapid development of inkjet printing technology, people began to try to print the film layer of high-performance electronic devices by means of inkjet printing. As a non-contact, pressure-free, and maskless printing technology, inkjet printing technology can accurately spray small droplets (picoliters or femtoliters) on the desired position, and form a thin film after the solvent evaporates, dries and solidifies. . The inkjet printing process has the advantages of low cost, large area, and environmental protection, making this technology gradually become a wet method for preparing microelectronic devices, such as organic electroluminescent OLED devices (especially organic full-color display screens), color filters in LCDs, etc. ...

AI Technical Summary

Problems solved by technology

[0004] In the preparation process, there is a problem that is easily overlooked and has not been solved: the solvent volatilization of the ink droplets printed first is greater than that of the ink droplets sprayed after being exposed for a long time, so the volatilization rate of each ink drop cannot be guaranteed to be the same. After the substrate is on the substrate, the volatilization of the solvent at the initial printing end is greater than that at the rear printing end, so that the solvent at the rear printing end replenishes the initial printing end. Inhomogeneous; at the same time, due to the instability of the nozzle in the rapid inkjet, the amount of liquid spray may be insufficient in a certain period of time, resulting in uneven film layers and small dark areas (under light source irradiation) The area where the film layer appears below is thinner), which greatly affects the film quality of the device film layer

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