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.
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