E-ink has been mired in patent stagnation for a long time. I remember 5+ years ago when the Kindle was getting huge there were rapid increases in contrast, color prototypes like Mirasol that just disappeared etc. I supsect someone bought them and quashed it so they can ensure low production costs and high sales as they are the only "legal" source and don't have to spend money creating manufacturing for larger/better tech. At least that's my cynical view of it. ClearInk has been teasing relflective color prototypes for a while and a purchasable tablet is always "right around the corner" for years but I am not holding my breath. They said monitors are many years away so to me that means 10 with their progress so far. There is no technological block to large E-ink/reflective tech panels...they don't use some rare or exotic materials or have some super expensive manufacturing process using unicorn blood. We could easily have desktop displays using them but it's far more profitable to sell 6-9" e-reader displays to Amazon etc that have a high profit margin.

This company https://www.visionect.com/blog/32-inch-eink-development-kit-... makes a 32" product for signage that doesn't seem to have any input for normal computer use...but its 3500eur. I don't know if they paid huge licensing fees etc or what but the pricing is mental for the tech/materials involved and seems to be purely business/supply stuff. The largest I have seen otherwise is the Dasung stuff that's 13" and 1000eur or the Onyx Boox MAX 13" that is a self contained E-reader and has terrible lag when used as a monitor. I have not found anything between the 13" and this singular 32" available and nothing but the small Dasung designed to be used as a monitor.