Some of the technology is possible with today's technology and relies on persistance of vision (it was demonstrated successfully in 2006).
Since it provides only surface volumetric capabilities, it won't be able to show the Death Star under construction being shielded by a station on the surface of the planet as in the film.
A year later, there was an attempt to create a fully volumetric display using two rotation axises, called "ultra ORB", and an early demo presented, but I haven't found any indication that this project succeeded beyond that stage.
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