Frame load speed of digital video?

I now understand _most_ of the details about frame rates, interlaced and progressive etc.

However, I was watching a video describing the technique of getting to 24fps "to look like film". Ironically the demo video itself looked quite flickery: more than I would like, and it was using 24fps progressive. I do not remember true film flickering as badly.

So I am wondering how fast the frame is filled from start to finish, in a progressive frame load. I would imagine that film shuts the shutter, moves the film, opens the shutter and so on. I reckon that could be done far faster than 1/24 second, so you get less flicker. If video actually takes 1/24 second to fill the frame, then of course you will get more flicker.

I have something of a bee in my bonnet regarding video flicker, as some of you may know ;)

So any input would be gratefully received.

EDIT: I looked for a more suitable forum area, but could not see one.

Nick