The VFD module supports both 8-bit parallel and SPI modes of communication. The SPI protocol allows to write and read pixels so no RAM is required to buffer the display (most 128×64 SPI displays require a full 1K RAM buffer since you cannot read from the display memory). The module requires 5V, and does draw quite a bit of current, up to 500mA. There is a VFD driver and 60V boost circuit on the back. You can probably use 3.3V logic to communicate with the module, as long as it is powered with 5V
Eink, E-paper, Think Ink – Collin shares six segments pondering the unusual low-power display technology that somehow still seems a bit sci-fi – http://adafruit.com/thinkink
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