So Sharp Memory LCD isn't quite unpowered, but it is measured in hundreds of microwatts of power.... Nearly power free. And this is while updating the screen.

So Sharp Memory LCD isn't quite unpowered, but it is measured in hundreds of microwatts of power.... Nearly power free. And this is while updating the screen. EInk is truly 0 energy to hold an image.... but each refresh uses a lot of energy. IIRC, the breakeven vs Sharps memory LCD was like 15-minute refreshes. ---------- Many battery packs have internal leakage in the ~50 microwatts region just a magnitude below to the power needed for Memory LCD. So Sharp Memory LCD is close to the point where we stop caring about power consumption at all. But not QUITE zero or otherwise ignored. Still very impressive how low they got.