A method and system for controlling the accuracy of ink droplet drop point for inkjet printing

Abstract

The invention belongs to the technical field of inkjet printing, and specifically discloses a method and a system for controlling the precision of ink droplets for inkjet printing. The method is as follows: 1) moving the nozzle holes to the test printing area for test injection, detecting the offset value of the ink droplet landing point corresponding to each nozzle hole, and then obtaining the overall offset compensation value of the ink droplet landing point; 2) using the ink droplet The overall offset compensation value of the drop point, which compensates the positional accuracy of the nozzle hole relative to the pixel pit of the substrate as a whole; 3) Start the nozzle hole for formal printing, and detect the deviation value of the drop point corresponding to each pixel pit during the printing process; 4) According to the deviation On the one hand, the firing sequence is adjusted to compensate for the positional accuracy in the substrate moving direction, and on the other hand, the moving distance of each nozzle in each stroke is adjusted to compensate for the positional accuracy in the nozzle moving direction. The invention can compensate for multiple errors in the process of inkjet printing, and is especially suitable for applications such as high-resolution displays, electronic components and the like manufactured by means of inkjet printing.

Description

technical field [0001] The invention belongs to the technical field of inkjet printing, and more particularly, relates to a method and a system for controlling the precision of ink droplets for inkjet printing. Background technique [0002] Inkjet printing technology is an emerging display panel manufacturing process, which mainly uses a solvent to melt organic materials, and then directly prints the materials on a substrate to form an organic functional layer. Compared with the traditional evaporation process, this method can print the required amount of organic materials, thereby saving 90% of raw materials. At the same time, it does not require a vacuum environment and an expensive precision mask, allowing the production of substrates of any size. 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 display manufacturing equipment is a do...

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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