Originally Posted by Alan Gouger
I am a film buff so I do not care about the 120hz but I have to say I love the Film mode with Blank Frame insertion.
Actually, the VW200 uses the 120 Hz panels in two quite different ways, each of them separately configurable (Motionflow Film Projection and Motionflow Motion Enhancer, in the "Picture Menu"). One of them, Motionflow Film Projection, is
important for truly correct film reproduction.
With a 60 Hz projector, movie frames (at 24 fps) must be shown alternately 2 times and 3 times (which, as you certainly know, is the "frame" version of "2/3 pulldown"). This means that (say) odd-numbered frames are shown for 1/30 of a second and the even-numbered frames are shown for 1/20 of a second — and none of them are actually shown for 1/24 of a second. Some people can see this discrepancy, some cannot. It is known as "micro-judder".
With a 120 Hz projector, on the other hand, 24 fps film material can be shown correctly: 5 times per frame (5 x 24 = 120), so each frame is displayed for exactly
1/24 of a second.
It is conceivable that the VW100 and the VW200 both support a 48 Hz refresh rate, which is (of course) a simpler way to achieve true 24 fps projection. But there is no mention of this anywhere in Sony's literature. A 72 Hz refresh rate (3 x 24 = 72) is used in some PC-based playback systems, for the same reason (elimination of "micro-judder").Side-note:
Theater (film) projectors actually show motion pictures at 48 fps — each frame is shown twice, with a brief blank interval in between each showing. The reason for this is heat. Showing a film frame continuously for (nearly) 1/24 of a second would overheat (and possibly burn) the film! To accurately reproduce "movie theater flicker" electronically, you would probably need to project at 96 Hz (for an "on/off/on/off" pattern per frame) or at 144 Hz (for a "2on/1off/2on/1off" pattern per frame).