Well, cell phone manufactures apparently feel the same way. Already we have phones capable of 3D displays in Japan (to at least give the illusion of a holographic image reaching out from the screen) though so far it's mostly just a gimmick, because there aren't a lot of applications that take advantage of it and it's not practical for anything that involves a lot of text.
Regardless, companies seem to be taking the idea seriously, because prototypes continue to be developed that emphasize the 3D display instead of just using it as a novelty. The real problem is finding an application for it that would make money. Uh, have you considered a little thing called porn? Hello?
So what about our full-on Princess Leia hologram? Well, companies like Samsung and Infosys have already filed patents on the related technology, so they're working on it. India-based Infosys says their device would display the images using "...a projector with a laser source and micro holographic optical elements lenses." Though they also claimed it version would be available by 2010, so they better get busy.
Meanwhile Samsung's patent would work sort of like a tiny version of the rear-projection TV's that were popular before plasma came along. In their words, "...source images emitted by the optical unit are three-dimensionally displayed on a plane spaced from the hologram screen by a predetermined distance."
Hurry up with that shit, Samsung! We have a series of practical jokes we want to play that involve convincing Grandpa his house is haunted by tiny ghosts.