1080p vs 1080i with progressives scan?
I’ve always understood that 1080p is superior because it has progressive scan (refreshes every pixel every refresh) vs 1080i, which alternates refreshing between even and odd pixels. That I understand.
What I don’t understand is “1080i WITH progressive scan”. Is this just another name for 1080p, or something “in between”?
It seems to me that progressive scan is progressive scan, and means the same thing in each kind of TV? In other words, how can you have BOTH interlaced AND progressive scan at the same time when they mean opposite things?
(BTW, it is a 51″ HDTV CRT rear projection, so is the “i” and “p” might not make as much difference as on an LCD?)
The first two answers answered my question, albeit from two different ways! Appreciated! With further research, it has a native resolution of 1080i, and upconverts 720p. So that clears it up. I got it for free, so it’s all good, but just wanted to know what I was dealing with. THANKS!
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i vs p…
defining i and p for others…
i means interlace so have the scan lines are displayed then the other half the lines are displayed. This was done eons ago to keep the picture from flickering. Today, they have other ways to prevent picture flicker.
p means progressive, every scan line is displayed in order.
In case of both LCD and Plasma, the end result is the same for all programming material 30 frames per second and below. The reason is that LCD and Plasma TV’s MUST decode interlace pictures into what amounts to a progressive one before it displays it.
In your case, you said CRT projection. It will display an i the way CRT’s have always displayed them, half the field, then the other half. The chance you can see any difference between i and p is very small.
As for 1080i with progressive… probably market speak but could be that they are decoding i into p like all LCD’s do anyway.
It is always fun to try to understand “marketing material..”
What is important is the NATIVE resolution of the TV.
Say the native resolution of the TV is 960 x 540. This TV can definitely play 1080i. But can also do 480p progressive scan!
Or say you have a 1280×720 TV. This can do 1080i, 480p AND 720p, so it is quite possible to do both 1080i and some progressive scan.
So, the TV can do 1080i and most likely can also do 480p , which satisfies the “1080i with progressive scan”.