>> http://en.wikipedia.org/wiki/Surface-conduction_electron-emitter_display
>
>  Yes.
>
>  Perhaps a bit surprisingly they consume less energy than LCD screens.

Not really, LCDs have to be one of the most inefficient designs ever. 
Firstly huge amounts of white light is generated with LEDs that are around 
10% efficient.  Then at most 50% of that white light is absorbed by 
polarisers.  Then at absolute maximum 20% of the polarised light is passed 
through the colour filters (the red filter has to block all green and blue 
light, ditto for the other two).

In the end you have a device that is usually less than 1% efficient in 
total.

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