Originally Posted by sarangiman
But the lamp modulation graphic that Sony provides shows 240Hz processing for 3D. If you draw this out, for the first 1/24s, you have 6 Left
frames & 6 Right
No that's not correct. Those values like "240 Hz" are misleading. It means that the Sony needs 1/240th second to completely show one frame. So a full frame can only be shown every 2/240th seconds or 1/120th seconds, that means the Sony, like nearly all other shutter projectors can show 120 fps or 120Hz max. Otherwise they would do triple flash and show every 24p frame 3x per eye and you won't have any flickering behind the glasses.
With 120 Hz, this is 60 Hz per eye, 24p-material can only be shown with 48 Hz per eye, otherwise you'll need a 3:2 pulldown (which is what Epson does for example, they can also only show 120 fps btw.).
So if no 3:2 pulldown is done, you can only create ONE interpolated frame per eye. I think that the difference between FI low and high in 3D is, that in high, there's always one frame interpolated, and in low only in some scenes (slow pans for example).
In my opinion it would be possible to do a 3:2 pulldown in high mode and smooth it via frame interpolation but it seems that Sony isn't doing this.
With natural 60p material in 3D there is no possibility for any frame interpolation because as I stated, 60p per eye is the maximum no. of frames that can be shown, that's why you don't see any effect.
PS: Even if the Sony could do 240 fps, you'd only have 5 frames per eye at the max. not 6! So one original and 4 interpolated ones. Thats what it possible in 2D with 24p material, there it's possible to generate max. 4 interpolated frames. But I don't know what Sony is doing here exactly.