[jarfil]

Eink used to be expensive, have slow refresh rates, and no color. OLED screens on the other hand have vibrant colors and can show videos. The concept of OLED keycaps is still superior, but it needs to be realized much better and much cheaper to be a top seller.

[emsy]

The problem is that unlike a phone or a tv these will probably be on for the whole workday, so 8h+ with little change to what is displayed and probably at a high contrast. The burn in will probably be an issue.

[teraflop]

That's an easily solvable problem -- just have each individual key label bounce around the keycap like a DVD player screensaver.

[TheRealPomax]

What burn-in? E-ink is a passive technology, it's not "on" like liquid crystals that have to constantly be pulled into a specific configuration by applying fresh charge, and will settle in that configuration over time as they find the lowest energy state amongst themselves that then has to be overcome with a higher charge.