[Open-graphics] Interlaced vs. progressive scan HDTV

[James Richard Tyrer]

I have done a little research on this and now have a moderate headache. :-)

It appears that many HDTV sets display 1080p which they generate 
internally (those with so-called 3:2 pull down have to do it) and all 
flat panels are progressive (although most of them are currently 720 
lines).  Strange thing about 3:2 is that they don't display it at 48 fps 
as theaters do (24 fps movie projectors have a two blade shutter to 
avoid flicker) but rather 60 fps so the progressive is still 3:2. 
However, these TV sets don't seem to accept 1080p input.

So, it would appear that we are going to need: 480i, 480p, 720p, 1080i, 
& 1080p if we are going to interface to TV -- do we need other formats 
such as 525i?  However, this doesn't mean that we would need an 
interlacer/deinterlacer (doing 1080i is the same as doing 480i).  We 
would have the whole image in memory and all that needs to be changed is 
the way it is read out to produce either a progressive or interlaced 
signal.  The only problem is with movie playback where we need to do the 
3:2 pull down correctly.

-- 
JRT