> Anyway, I believe those projectors, like TVs and monitors, actually
> perform a sweep over the screen, and we see it as a whole image due
> to... guess what, persistence of vision ;-) (and maybe to screen
> persistence on TVs and monitors). What would probably be needed is to
> slow down the scanning in the projector or to use a very high speed
> camera.

No, those projectors use LCD panels inside, every pixel is on continuously,
and a whole line is updated at a time.  So if you like it "sweeps"
downwards, but you will never see any flicker because the pixels don't "turn
off" like they do in a CRT.

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