1080p Hdtv

You may know that 1080i refers to 1080 lines of vertical resolution interlaced. This means that instead of 30 frames a second, the Tv displays 60 fields per second, where each field contains alternate lines of the picture. Because the fields are refreshed so quickly, your brain interprets the signal as 30 full frames per second.

Sony Bravia

720p means 720 vertical lines of progressive scan video where every frame of the
signal is displayed in its entirety, giving a higher-quality, film-like appearance to
the picture.

Most Hdtvs or Hdtv-ready Tvs keep whether 720p or both 1080i and 720p, very
few keep 1080p Hdtv. Part of the infer for this is that very few broadcasters
want to broadcast 1080p signals. The infer for that is that 1080p requires
significantly higher bandwidth than whether 1080i or 720p. And for broadcasters,
bandwidth is a costly commodity. Using up more bandwidth for one signal means
that there is less room for other channels. So in many cases, opting for a 1080p
signal would mean dropping or degrading other channels.

Is 1080p Hdtv important? Well, yes and no. Not all video footage benefits greatly
from progressive scan. Sports broadcasts and operation movies look better at 720p
than 1080i because there is lots of fast movement and the interlacing in 1080i is
sometimes noticeable, reducing the potential of the picture. Movies and Tv shows
where there is not a great deal of fast operation look better at 1080i than 720p because
the higher resolution has a greater impact on potential than the progressive scan,
which has small effect where there is only a small unlikeness in the image in the middle of
frames.

So, while 1080p Hdtv is the best of both worlds, the cost in terms of bandwidth, is
very high compared to the advantage for most habitancy most of the time.

1080p Hdtv