Sweden-based rdot demonstrated its flexible printed electrochromic display prototypes at SID Displayweek 2018. These are simple displays that are produced using screen printing technology. rdot says that its displays will be ultra-low cost when commercialized.
rdot's displays are monochrome segmented (passive-matrix ones are under development) e-paper displays that are non-volatile (but only up to around 15 minutes, these are not long-term). The displays can be be produced in any color.