displays without... solids

[aeronox]

i've tried searching but i'm not sure of the proper name for these things... interested in 'holographic' displays but without the normal glass or anything. i was thinking maybe there is an invention that uses lasers and/or interference to produce light/whatever. do you know? thx

[brentd49]

^bump.
I have also wondered what the current level of quality is in constructing one of these devices. I'm sure there are people working on such a thing.