Ink-Jet Printing towards Ultra-High Resolution: A Review

Ink-jet printing combines large-area film fabrication with low-cost solution processing. A high-resolution display calls for small-sized and closely arranged pixels, which can be realised using ink-jet printing. Here, we introduce the relevant steps of ink-jet printing, namely, droplet formation, falling, hitting the substrate, spreading, and the formation of a pixel. On the basis of a summarisation of factors that affect pixel formation, an approximation model is established to explore the minimum size of a pixel.