Originally Posted by Ron Jones
I suspect that quite a few projectors can accept 48 Hz inputs (or 47.95 Hz) in 2D (my 3+ year old Epson 6500UB can) via HDMI. However the real issue is frame packed 3D at 1080p/48 (with 48 unique frames for each eye, each second). At this point there are no sources that support this and the first commercial movie being shot at this frame rate (the Hobbit) has not yet been released in theaters. Avatar 2 and Avatar 3 will also be shot at a high frame rate, certainly at least as high at 48 Hz and perhaps as high as 72 Hz. The current HDMI standard (ver. 1.4a) defines the following full resolution 1080p 3D frame packing formats (other formats are not listed below):
Mandatory 1080p frame packing 3D Formats (required for all HDMI 1.4a 3D displays)
1080p @ 23..98/24 Hz
Primary 1080p frame packing 3D Formats (required + optional)
1080p @ 23.98/24 Hz
1080p @ 29.97/30 Hz
Secondary 1080p frame packing 3D Formats (additional optional formats for which the HDMI 1.4a standard defines the signal timing requirements)
1080p @ 59.94/60 Hz
1080p @ 50 Hz
1080p @ 25 Hz
Right, nothing out there now is going to take 48Hz 3D content that I'm aware of, as it's not a standard. Additionally, that's going to be 96 individual frames per eye, per second, and is going to cause some more serious brightness issues I would suspect. Even something like the SIM2 that uses the DLP TripleFlash tech (144 frames per second) can't do a multiple of that, and so unless you have a passive 3D stack from Runco, you're going to have some seriously dim images.
Of course, you also need Blu-ray to feed you twice the bitrate of a current 3D film to pull this off as well, and given the current bitrates of film and the specs on Blu-ray, we're looking at issues with compression and disc size as well. I'm pretty sure we won't see 48Hz 3D at home for a while due to those. Now if they want to put out a 48Hz 2D one that uses frame-packed 24p to pull it off, that would be very interesting I think. They can make it a bonus disc in the 3D set and say it needs a 3D TV, but to not use glasses. I'd be interested to see if that works.