Confusion over 1080i vs 1080p

[Gundam God]

37 inches is quite common now for 1080p screens.

I recently purchased a Toshiba 37Z3030D which is a 1080p set, 10-bit, proper 24fps support, motionflow and cost me £760 inc delivery. Comes on wednesday.

 

[Corasik]

720p is 30FPS, 1080i is 30FPS if anything, 1080i is possibly worse.

You never see the full 1080 pixels at the same time, ergo, 720p is better in that respect.

If you deinterlace a 60hz field rate 1080i source, you get 30 frames of 1920x1080 video, which is exactly normally* the same as 1080p. All LCD panels, and most Plasma panels automatically deinterlace 1080i into frames, and then using a frame doubler replay at 60hz, so to all intents and purposes there is no difference between 1080i and 1080p.

1080i will give the illusion of 1920x1080 assuming the panel has sufficient resolution, but in the real world very few true 1080i panels exist. Most 1920x1080 panels are progressive anyway. There were some 1024x1080 interlaced plasma panels, but they never really achieved any great popularity, and their limited horizontal resolution really means they are no better than 1024x768 progressive plasmas, as they have lost almost half their horizonal resolution.

* Except when a 1080i video camera is used, some 1080i cameras actually record the fields separately, De interlacing these causes horrible display errors.

 

[Rich JR]

I dont think anybody has quite answered your question.

There is a lot of confusion over this issue.

Its a shame we have been bombarded with so much advertising for 1080p.

Just the facts here.
1) There are no interlaced flat panels, flat panel TVs can not display an interlaced image.
2) The resolution of a picture is determined by the number of pixels. The more pixels, the sharper the image.
3) There are 3 standards that have emerged for High definition video

720p 1280 x 720 pixels
1080i 1920 x 1080 pixels
1080p 1920 x 1080 pixels

The first is usefull for 1280 x 720 pixel CRTs which do exist, just not many (if any in europe), look to the USA for these big CRTs. Remember the native interlaced condition of a CRT and why we all scrabbled around with progressive DVD players to feed our 32" sony wegas a few years ago !!

The second is THE broadcast standard it uses less bandwidth than 720p.

The third standard is where it gets silly, in the age of flat panel TVs (plasma or LCD) and fed 1080i you will allways see a 1080 image displayed progressively
...why ?

because the panel has to display 1080p it cannot do anything else

read on...feature-article-1080p-3-2007-part-1.html and see how 1080p is a marketing gimick

 

[Corasik]

With the exception of the 1024x1080 plasma panels, which drive alternating lines, and really are 'interlaced' flat panels... So its not quite true that there are no interlaced flat panel screens.

But try finding a 1024x1080 plasma these days.. It was never a good panel, beaten by most 1024x768 progressive panels for picture quality, and now rendered obsolete by the 1920x1080 plasma panels

 

[james.miller]

720p is 30FPS, 1080i is 30FPS if anything, 1080i is possibly worse.

You never see the full 1080 pixels at the same time, ergo, 720p is better in that respect.

720p can be any refresh rate you like, just like 1080p - 24hz,25hz,48hz,50hz,60hz...whatever you like. stop with the posting, your just confusing the guy lol.



as far as 1080i vs 720p on a 720p panel goes, it depends entirely on how good the tv's scaler is. some of them are awful at de-interlacing 1080i and scaling it down to 720p. others fair a lot better and on thoese set's there are advantages to be had.

 

[Rebelius]

read on...feature-article-1080p-3-2007-part-1.html and see how 1080p is a marketing gimick

gonna start reading things before you post them?

straight from the conclusion:
"In fact, 1080p does matter. We all need it, so in our opinion, you should be concerned. This is our attempt to convey that message.

... the point remains, if we narrow down the issue to a single parameter, that of resolution, aside from possible future displays that are integer multiples of 1920 x 1080 (serving to diminish pixel structure and improve the performance of scaled image output from lower resolution formats), 1080p is king, period."