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1080i v 720p

Discussion in 'Televisions' started by lochindaal, Jul 13, 2005.

  1. lochindaal

    lochindaal
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    This may be a how long is a piece of string kind of question.

    I am considering the new Samsung SP46L6HXX. I have noticed from the manual it does not support true 1080i only 720p. If trying to buy a "future proof" TV can you tell much difference watching the 2 standards.
     
  2. KableMan

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    I can't tell the difference on the SP50L7HX they both look equally amazing with HD and if anything 720p looks better when upscaling DVDs. Also because 1080i is interlaced I thought that 720p, being progressive, was in fact better as it equates to more lines in practice especially when you consider that a TV with 1280x720 native resolution will scale 1080i images to fit it - this is probably why I can't see a major difference.

    Now 1080p TV's will be a different thing entirely and will obviously be a big step up. Although I don't think even the new 1080p models that are available in the US will accept a 1080p input only a 1080i - I think they rely on internal HDTV tuners instead.

    Cheers
    KableMan
     
  3. Br41ns

    Br41ns
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    :hiya:

    I agree with Kableman, i think 720p looks better and normally a progressive pic is better than interlaced.
    Sky HD is going to be predominantly 720p anyway and as Kableman said the new 1080p tvs that are on the horizon wont accept a 1080p feed, the tvs upscale the image to 1080p. :smashin:
     
  4. Razor

    Razor
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    The reason we cant see the difference between 720p and 1080i is that these displays only have 720 lines so a 1080i picture is reduced to fit on 720 lines. If we had 1080 display this wouldnt be the case and the difference would be noticeble. 1080 has 50% more lines than 720 so the improvement should be vast. There is a thread about this in the HD section it was current about 5 weeks ago.

    :)

    Kableman & br14n :hiya:
     
  5. DGtal

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    Which page of the manual is that on? In my manual it states that 1080i is supported?
     
  6. lochindaal

    lochindaal
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    Page 55
     

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  7. NicolasB

    NicolasB
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    It's more to do with horizontal resolution, actually. A so-called "HD" 42-inch plasma screen has a horizontal resolution of 1024 pixels. A true 720p signal is 1280 horizontal pixels. 1080i is 1920 horizontal pixels.

    If you want to count pixels, (1280x720)/(1920x1080) = 0.444. In other words, if you display 1080i on a 1280x720 screen, you lose 55.6% of the pixels. :devil:
     
  8. DGtal

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    The bottom box in that chart shows 1920 x 1080i, so does that indicate that the set is supporting true 1080i?
     
  9. KableMan

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    Hi lochindaal - this page appears in the SP50L7HX Manual as well word for word - I think "interlaced mode is not supported" appears simply because all DLP's with a native resolution of 720p will, as Razor says, scale the image to fit and will not actually show it as 1080i - it will however accept a 1080i input (which I think was your main cause for concern) I can confirm this to be true.
     
  10. Razor

    Razor
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    All this talk about 1080p is making my RD65 feel old and nervous :rolleyes: :rotfl:
     
  11. lochindaal

    lochindaal
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    I realised it was being scaled.

    I was wondering if anyone has a set that supports 1920 lines and has compared the two inputs and can they tell much of a difference?
     
  12. Liam @ Prog AV

    Liam @ Prog AV
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    There isn't yet a set that can do true 1080p. The new 1080p DLPs out soon use "wobbulation" - they have a resolution of only 960 x 1080 - the horizontal pixels flickering left and right to theoretically double the horizontal resolution. The jury is still out on this one, but I hated the old 720p wobbulation chip Samsung used in some of their sets (HD3). Rumours are the xHD4 (wobbulated 1080p chip) is much better, we'll have to wait and see I guess.

    There is one chip from TI that is something like 2100x1080 resolution which I hear will find it's way into a few high end DLPs (mucho dollar) next year. The 1080p DLPs we'll see end of this year will all be wobbulated efforts though (and still pretty pricey).

    I wouldn't worry about 720p not being "future proof" (dangerous phrase). Most 1080p screens don't actually accept 1080p, nor is there any 1080p material to watch!! By the time it is mass market the odds are we'll all want 2160p...
     
  13. NicolasB

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    As Liam says, reports of the newer DLP sets suggest that wobbulation is not a problem this time round. We'll see.

    I do wish people would stop saying that. Yes, 1080p broadcasts won't be with us for a long time, but that doesn't mean that a 1080p-capable screen is useless. On the contrary: you need a 1080 line display to be able to display 1080i without major loss of detail.

    And that's before you start to consider PC output at 1920x1080, PS3 output at 1920x1080 or the use of an external video scaler to deinterlace 1080i - all of which will require a 1080p display.
     

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