It's a weird little thing, an LCD where each pixel has a bit of memory. This means that you can simply provide enough power to the LCD to drive the pixels and b

It's a weird little thing, an LCD where each pixel has a bit of memory. This means that you can simply provide enough power to the LCD to drive the pixels and because of the built in memory it will display whatever it had been displaying, there's no need to continuously refresh the display from a buffer or any of the usual tricks of driving a display. Unlike true e-ink it won't retain its state while unpowered but it does require incredibly low power for operation (tens of microwatts). They are commercially available components: http://www.sharpmemorylcd.com/ http://www.sharpmemorylcd.com/