Digital cinema refers to the use of digital technology to distribute and project motion pictures. A movie can be distributed via hard drives, optical disks (such as DVDs and Blu-ray Discs) or satellite and projected using a digital projector instead of a conventional film projector. Digital cinema is distinct from high-definition television and, in particular, is not dependent on using television or high-definition video standards, aspect ratios, or frame rates. Digital projectors capable of 2K resolution began deploying in 2005, and since 2006, the pace has accelerated (2K refers to images with 2,048 pixels of horizontal resolution).
Granted this is not a lot of info, but surprisingly there isnt a lot of info on this subject.
Which I could find anyway. :)