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Bingle, LCDs and electrophoretic displays both use electric potential to manipulate their media so they don't inherently use a lot of power. What consumes power is most LCDs are light valves that screen out ~95% of the light pumped through. That's where the real power consumption is. Electrophoretic, cholesteric several other display types are reflective so the use of photons is inherently more efficient.
With that said, if an E-Ink display were updated at 60Hz and compared to an LCD's power consumption (without counting the backlight), the LCD would probably win because data signals run about 1/2 to 1/3 the potential of electrophoretic displays. A digital wrist watch is an LCD but comparing the technologies gets complicated.
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