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  1. #1
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    Question 480p, 480i, 720p, 720i, 1080i <--- What's with the i and p?

    I'm looking at buying a projector for my rec-room to turn it into a home theater. There has been a lot of innovations over the past 5+ years when it comes to televisions as HD has been changing and has several different standards. I figured that I wouldn't bother keeping up all these changes until I bought a house which I finally did this summer. So now I'm playing the technology catch-up game.

    I understand where the numbers in 720p, 720i, 1080i comes from. I'm pretty sure they refer to the number of horizontal lines of resolution a television is capable of. But the 'p' and the 'i' at the end I'm not 100% sure of. I'm guessing if it is an 'i' then the television would have to be in an interlaced mode where as the 'p' would not. Am I right with that?

  2. #2
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    Re: 480p, 480i, 720p, 720i, 1080i <--- What's with the i and p?

    Quote Originally Posted by Spankin Partier View Post
    I'm looking at buying a projector for my rec-room to turn it into a home theater. There has been a lot of innovations over the past 5+ years when it comes to televisions as HD has been changing and has several different standards. I figured that I wouldn't bother keeping up all these changes until I bought a house which I finally did this summer. So now I'm playing the technology catch-up game.

    I understand where the numbers in 720p, 720i, 1080i comes from. I'm pretty sure they refer to the number of horizontal lines of resolution a television is capable of. But the 'p' and the 'i' at the end I'm not 100% sure of. I'm guessing if it is an 'i' then the television would have to be in an interlaced mode where as the 'p' would not. Am I right with that?
    Yep you're right. P is for Progressive Scan. Here's a couple of links for ya:

    http://en.wikipedia.org/wiki/Display_resolutions
    http://en.wikipedia.org/wiki/Progressive_scan
    http://en.wikipedia.org/wiki/Interlace

    When buying a projector, it's important to factor in the price of replacement bulbs too. Some of them are outrageously expensive.

  3. #3
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    Re: 480p, 480i, 720p, 720i, 1080i <--- What's with the i and p?

    One thing to remember is that currently HD broadcast is maxed at 1080i for 99.9% of cable/satellite tv.

    I went with a 1080p tv because I wanted to be ready when they get TV broadcast to 1080p and blue ray at full
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  4. #4
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    Re: 480p, 480i, 720p, 720i, 1080i <--- What's with the i and p?

    Thanks for the info guys!

    Currently I'm favouring this projector: http://www.tigerdirect.ca/applicatio...5&Sku=V18-5104

    I don't have cable or satellite at home, and am not planning on getting them any time soon. This would strictly be for playing DVDs from my computer, as well as my anima (which is now available in HD). I have very good lighting conditions. We had a 800x600 projector where I was living before and I was fairly happy with that. The DLP 'rainbow' effect was visible so I'm aware that it'll exist on this projector as well. There are some new high speed DLPs that don't suffer from this affect, but I'm unaware of any projects that use them in my price range.

  5. #5
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    Re: 480p, 480i, 720p, 720i, 1080i <--- What's with the i and p?

    might as well get some rabbit ears as well, assuming your close enough to the city to pick up broadcasts, and pick up some free hd local channels.

    many say that the over the air stuff is the highest quality image.
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  6. #6
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    Re: 480p, 480i, 720p, 720i, 1080i <--- What's with the i and p?

    i is disgusting. It may not be that bad at home but at BB or wherever when they are all on the wall together an interlaced TV sticks out like a sore thumb. There's really no reason to not get a 1080p LCD.

  7. #7
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    Re: 480p, 480i, 720p, 720i, 1080i <--- What's with the i and p?

    I just set up a projector for my Dad that's 1080p capable. We turned it on and had to project it against the wall as he hasn't bought a screen yet, but the picture still didn't look bad. This was at a very low 480p too. I can't wait to see what a Blu-Ray disc will look like on it after the screen is put in.

    Oh and btw, I just got a new software update tonight on my Directv HD-DVR. After the reboot it showed some new features that are coming in future updates. One new feature is 1080p! I guess the days of Blu-Ray being the only real way to get 1080p are finally coming to an end.

    Woohoo! I just found out that Directv is finally launching HD locals for my town tomorrow. No more crappy old antenna on my roof.
    Last edited by kbohip; 10-22-2008 at 01:37 AM.

  8. #8
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    Re: 480p, 480i, 720p, 720i, 1080i <--- What's with the i and p?

    Quote Originally Posted by Brandito View Post
    might as well get some rabbit ears as well, assuming your close enough to the city to pick up broadcasts, and pick up some free hd local channels.

    many say that the over the air stuff is the highest quality image.
    In Canada we have a couple more years to wait until that happens. I'm not looking forward to it as I only get one clear station. The other 4 have various stages of snow. Its my understanding that unless you have a good clear picture now, you will not be able to view any image under digital broadcast.

  9. #9
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    Re: 480p, 480i, 720p, 720i, 1080i <--- What's with the i and p?

    Quote Originally Posted by kbohip View Post
    I just set up a projector for my Dad that's 1080p capable. We turned it on and had to project it against the wall as he hasn't bought a screen yet, but the picture still didn't look bad. This was at a very low 480p too. I can't wait to see what a Blu-Ray disc will look like on it after the screen is put in.

    Oh and btw, I just got a new software update tonight on my Directv HD-DVR. After the reboot it showed some new features that are coming in future updates. One new feature is 1080p! I guess the days of Blu-Ray being the only real way to get 1080p are finally coming to an end.

    Woohoo! I just found out that Directv is finally launching HD locals for my town tomorrow. No more crappy old antenna on my roof.
    that's good to hear about 1080p. it is rumored that my h21-100 is supposed to be 1080p compatible, just waiting for the signals to change.

    btw, there's a Cutting Edge firmware release for your dvr coming the 24th and 25th if you want it.

    http://www.dbstalk.com/showthread.ph...24#post1849924

    you have to force it manually though, go to that thread for details.

    http://www.dbstalk.com/showthread.php?t=90847

    that thread shows how to force an update
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  10. #10
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    Re: 480p, 480i, 720p, 720i, 1080i <--- What's with the i and p?

    Hmm, never knew about that CE thing Brandito. I may have to try that out!

  11. #11
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    Re: 480p, 480i, 720p, 720i, 1080i <--- What's with the i and p?

    Quote Originally Posted by Spankin Partier View Post
    In Canada we have a couple more years to wait until that happens. I'm not looking forward to it as I only get one clear station. The other 4 have various stages of snow. Its my understanding that unless you have a good clear picture now, you will not be able to view any image under digital broadcast.
    I've heard that about the switch over to digital as well. Right now though, all of the analog signals I get look pretty bad. All the local HD channels I get over the air look fantastic (720p television).

  12. #12
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    Re: 480p, 480i, 720p, 720i, 1080i <--- What's with the i and p?

    Maybe Canada's FCC equivalent will allow broadcasters to up their power when they switch.

  13. #13
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    Re: 480p, 480i, 720p, 720i, 1080i <--- What's with the i and p?

    yeah mine updated yesterday also, did some reading at the directtv site, says the only thing that will be 1080p as of right now is ppv, so I am assuming that it started broadcasting that way yesterday or today.
    Which guess I will never see it, until Football gets it!

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