Techniques for print ink droplet measurement and control to deposit fluids within precise tolerances
US10784470B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2017 |
| Grant date | Sep 22, 2020 |
| Priority date | — |
| Expiry date | Sep 27, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K71/00
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An ink printing process employs per-nozzle droplet volume measurement and processing software that plans droplet combinations to reach specific aggregate ink fills per target region, guaranteeing compliance with minimum and maximum ink fills set by specification. In various embodiments, different droplet combinations are produced through different printhead/substrate scan offsets, offsets between printheads, the use of different nozzle drive waveforms, and/or other techniques. These combinations can be based on repeated, rapid droplet measurements that develop understandings for each nozzle of means and spreads for expected droplet volume, velocity and trajectory, with combinations of droplets being planned based on these statistical parameters. Optionally, random fill variation can be introduced so as to mitigate Mura effects in a finished display device. The disclosed techniques have many possible applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.