everyone should look here: http://www.best-3dtvs.com/guides/what-does-600hz-sub-field-drive-mean/ for an explination that make sense.

I was to understand that the Original Movies shot on film, were at 24 fps, not 30 fps, as on our old TV sets, which put two 30 fps images on the screen interleaving odd and even lines. When we got flat screens and we evolved the Improved Definition TV (IDTV) or High Definition TV (HDTV) technology (which gave us Picture-in-Picture (PIP), which was the non-displayed “from memory” image of the interleaved 60 fps TV display, which displayed all odd and even lines on the screen simultaneously, which turned the TV into true 60 fps screens), we had a problem viewing movies in “Real Time”, because 60 fps is not divisible evenly by 24 fps, but 120 fps was. We see 5 frames of a movie at 120 fps in “Real Time”. True 3D is recorded using a “Stereo” camera system, which uses 2 cameras, shot at the same time, one image for each eye. A single-eyed person can’t see in 3D. One method used on true 3D TVs, use “Shutter” glasses that open and close viewing shutters at a 120 fps rate, but the shutters are interleaved and synchronized with the 3D TV, so you only see the image in one eye at a time, which matches the image speed of the 3D TV’s interleaved 240 fps output. The left eye sees 120 fps and the right eye sees 120 fps, but they see the 3D TV image in the left-right-left-right eye sequence. This emulates how our eyes really see in 3D or stereo, so we can judge distance, which is the 3rd dimension.