Ink drop point precision control method and system for ink-jet printing

Abstract

The invention belongs to the technical field of ink-jet printing, and particularly discloses an ink drop point precision control method and system for ink-jet printing. The method comprises the steps that (1) spray holes are moved to a trial printing area for trial spraying, the offset value of an ink drop point corresponding to each spray hole is detected, and then the overall offset compensation value of the ink drop points is obtained; (2) the position precision of the spray holes relative to pixel pits of a substrate is integrally compensated by using the overall offset compensation value of the ink drop points; (3) the spray holes are started to implement formal printing, and the offset value of each ink drop point corresponding to each pixel pit is detected in the printing process; and 4) according to the offset value, on one hand, the compensation position precision of the ignition sequence is adjusted in the moving direction of the substrate, and on the other hand, the moving distance of each nozzle in each stroke is adjusted so as to compensate the position precision in the moving direction of the corresponding nozzle. Multiple errors in the ink-jet printing process can be compensated, and the ink-jet printing method is particularly suitable for being used in the application occasions of manufacturing high-resolution displayers, electronic components and the like in an ink-jet printing mode.

Description

technical field [0001] The invention belongs to the technical field of inkjet printing, and more specifically, relates to a method and system for controlling ink drop point precision for inkjet printing. Background technique [0002] Inkjet printing technology is an emerging display panel manufacturing process, which mainly uses solvents to melt organic materials, and then directly prints the materials on the substrate to form an organic functional layer. Compared with the traditional evaporation process, this method can print according to the demand of organic materials, thus saving 90% of raw materials. At the same time, it does not require a vacuum environment and expensive precision masks, allowing the production of arbitrary large-sized substrates. It is considered to be a technological revolution that is expected to replace the evaporation process. The development of high-precision, high-adaptability industrial-grade inkjet printing and display manufacturing equipment ...

AI Technical Summary

Problems solved by technology

Small changes in the positioning of the ink droplet in pattern printing may lead to uneven brightness of the pixel pits on the display screen, or even short circuit and no light at all.

Among them, factors such as nozzle straightness and ink drop flight instability, platform mechanical error and alignment error, and environmental conditions are all sources of printing errors. The ink drop point accuracy of inkjet printing technology is affected by the coupling of various factors. The overall printing accuracy is not only related to one or two factors of inkjet technology, but also related to the improvement of the overall factors of inkjet technology, which limits the application of inkjet printing technology to a certain extent

[0004] In the prior art, some solutions for improving the accuracy of inkjet printing have been proposed, such as a multi-error compensation positioning control method and system for inkjet printing, which introduces the detection of ink droplet flight positioning deviation, nozzle positioning deviation and substrate positioning deviation. Real-time online feedback compensation for the motion platform, but it is difficult to obtain an accurate compensation model during the application process, and this solution has extremely high requirements for the fast response of the motion control platform and the compensation effect is not intuitive

Further studies have found that the technologies designed in existing patents and literatures still have the following deficiencies: On the one hand, they usually adopt the method of improving the structure of inkjet printing equipment to improve the accuracy of inkjet printing. A certain degree of precision improvement in the first step has no obvious effect on improving the accuracy of the final ink drop point and it is easy to introduce other errors; Feedback control or feedback adjustment of process parameters such as ejection waveform and flow field state during inkjet printing has high requirements on hardware and it is difficult to obtain an accurate control model, and the compensation effect is not good

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