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1080i vs. 760p

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Old 05-18-2007, 11:07 PM   #1
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Default 1080i vs. 760p

Hi guys, I am new to the world of high def and I wanted to get a 32" for my bedroom. I already have a Marantz SR-7400 receiver, Axiom speakers surround sound, and XBox 360...so I figured its time to get my visuals up to par.
One question I can not get answered through the web however has been the viewing difference between 1080i and 760p at small sizes. Progressive scanning is smoother from what I can tell, and I also heard somewhere that the almighty 1080p would be useless unless I plan on using it as a computer monitor. But at this small size, will it be useless to get a 1080i (or p)? I dont want to go any bigger than 32, so it will definitely be that size, and if I can get the best picture at 760p I will do that, since they are cheaper.
Thanks for your time
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Old 05-18-2007, 11:57 PM   #2
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It's 720p...not 760p and with the exception of a couple plasma models, 1080i is only available in CRT tube models not flat panels. You'll be better off with 1080p because your Xbox 360 games will look better.
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Old 05-19-2007, 07:32 PM   #3
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Some people are using the phrase "768p" to describe displays with 768 lines.

This is not really a good practice as there is no ATSC HD format of "768p" as there is with 720p, 1080i and 1080p. There are also displays with 1024 x 768, 1280 x 768 and 1366 x 768 pixels, so which one is "768p"?

It always gets confusing when it's not clear whether someone is talking about the signal format or the display format.

Any 1920 x 1080 progressive display (which is often refered to as a "1080p" display) will accept a 1080i input--in fact some of them will only accept a 1080i input and not a 1080p input. Regardless, it will display the image as 1080p, so it doesn't matter whether you have a 1080p source or not.

Last edited by BobY; 05-19-2007 at 07:37 PM.
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Old 05-20-2007, 08:36 AM   #4
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720p I meant. TVs with native resolutions of 720p or the newer ones out that have even 1080p instead of interlaced. Is there a noticable difference (since its relatively small screen) watching HD programs, or XBox 360 which I assigned the output to be 720p now, but it can also be 1080i if you have the TV.
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Old 05-20-2007, 09:13 AM   #5
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or the newer ones out that have even 1080p instead of interlaced.
This statement tells me you still don't understand the difference between the manner in which the TV displays the picture and the manner the signal between devices is transmitted, or the difference is not in the forefront of your mind. They are two different things.

All of the fixed pixel displays create their displays in a progressive manner. When you read about a LCD, for example, that will support 480i, 480p, 720p and 1080i they are talking about the signal format not the way the TV will display the signal. If it is a 720 or 768 line display the input signal will be converted to match and that input signal can be any of the supported formats.

Moving to the 1080 line displays it is true that some 1080 line displays will support only 480i, 480p, 720p and 1080i as an input while others add the ability to support a 1080p input signal. And when we talk about the 1080p signal it is usually at 60 frames per second, but to add even more variables, there are some sets that will also allow an input of 1080p at 24 frames per second and they refresh their screens at 120hz rather than the 60hz of most sets.

The main point to remember is there is a difference in the manner of how a TV creates its picture and the manner of how the signal is input. Your statement seems to blur the two very different issues.

Edit:
While a display that forms its picture using an interlaced scan is not as desirable as a display that creates its picture using a progressive scan, the same can not be said about the difference between the interlaced or progressive signal. Since the same information is sent via both the progressive and interlaced signals, for the majority of TV programming sent out today there will be no difference between 1080i and 1080p. If in the future they start to transmit 24fps (very unlikely) or 60fps (also unlikely) progressive signals then there could be a different conclusion. Right now today they transmit 720p at 60fps and 1080i at 30fps.

Last edited by rbinck; 05-20-2007 at 09:24 AM.
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