Rear Window is device operates pretty much the same way that closed captioning works on TV programs. It allows movie theaters to displays captions of a film's dialogue on a panel that is generally attached to a seat or a floor stand. Here's a list of theaters offering the Rear Window system.
Another way to help the deaf at theaters is the use of a second audio channel on the film to describe the action on the screen. The channel is blocked from running through the auditorium speakers but is broadcast just to those who have specially equipped headsets.
Another approach is called open captioning. It puts the captions directly on the movie screen.
