I'm trying to replace disposable paper notes with something that is simpler and more convenient. There are many lightweight LCD writing tablets like this one: https://www.amazon.com/Boogie-Board-8-5-Inch-Writing-PT01085CYAA0002/dp/B00AFPR68E/

But it looks like those are an LCD display with a touch sensor on top. I was looking for something with near-zero input lag and no visible pixels (like actual paper), like a more sophisticated version of a kids magnetic whiteboard.