I'm pretty impressed by what FOVI3D [1] has been doing w/ their light field displays. Here's a recent interview from SID Display Week this year [2] that's refreshing because the CTO (in the interview) goes into some of the details of the challenges they face and isn't unrealistic about how hard it'll be to overcome them.

[1] http://www.fovi3d.com/

[2] https://www.youtube.com/watch?v=GK4544D4PUo