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Hdtv

Discussion in 'Plasma TVs' started by gpc1, Nov 24, 2004.

  1. gpc1

    gpc1
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    is it true that a TV with anything over 720x1080 ( ie 777600 pixels) is HDTV suitable?
    Ie a screen that is 852x1024 ( 872448 pixels) is hdtv ready :confused:
    Greg
     
  2. loonatic

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    I guess yes and no is the answer.

    HDTV comes in two main flavours...720p and 1080i.

    720p works out to be 1280x720 pixels and 1080i is 1920x1080.

    The screen format you mention of 852x1024 is an ALiS resolution panel and is interlaced in nature meaning only 512 lines are displayed at anyone time...how this affects it's ability to work with HD signal I don't know.

    Hope that helps.

    Cheers, Lee
     
  3. Paden

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    :confused:
    So the figures 720 & 1080 relate to verticle lines not horizontal ones?
    (Don't be too harsh :D )

    Cheers, Paul
     
  4. MAW

    MAW
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    Just so, mate. And the resolution of the panel has NOTHING to do with being HDTV compatible or not, a SD panny is HDTV compatible, I believe the 852x1024 panels are not 720/50hz compatible, but will do 1080i, but crop the picture to 1024 vertical, and a corresponding proportion vertically to preserve the aspect ratio. Currently the 'most' HDTV compatible/ready panels are Pioneer, particularly if talking about digital video, but the TV versions, though they have this in their favour, are cruelly deficient in some other respects. No such thing as the perfect plasma, choose one you like and live with it, warts and all.
     
  5. Export Strength

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    For a TV to be true HD it must conform to one of the two broadcast resolutions; either 1280x720 or 1920x1080. Anything else is can only be concidered as either high or low resolution. The compatability of a screen is simply down to whether the on board processor can accept an HD signal. So Panasonic (852x480) Fujitsu/Hitachi (1024x1024 & 852x1024) and Pioneer (1024x768) are all HD compatable without being HD panels.
    You need a DLP - texus instruments mustang HD2 chip - front or rear projector for true HD pictures. This chip is 1280x720. Also sharp are releasing a 1920x1080 LCD TV soon.
    See my reply to another question for more info on the importance of 1:1 pixel mapping and linear scaling. It's in this section a little further down.

    (What is the quality on a 852 against a 1024 plasma?)
     
  6. MAW

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    Sanyo do a 1920x1080 projector, but it's about 40k!!!
     
  7. gpc1

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  8. Joe Fernand

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    ExportStrenght

    Whilst 1:1 pixel mapping is ideal its obviously only practical at any one of the numerous HDTV standard signals that an HDTV compatible TV can or should be able to receive.

    To lump a 1024x768 Progressive pixel array with an 852x480 Progressive Pixel array is to me not correct - the Pioneer and Panasonic 1024x768P arrays both adhere to the HD standards in that they can resolve the full detail of a 720P signal; Pioneer use the official HDTV logo in there marketing and this is only allowed on 'compliant' devices..

    Many of the 852x480 Progressive arrays are HD ready in that they can display an image from a 720P or 1080i signal - though they have to throw away detail to fit the signal on there SD (or ED) arrays.

    The 1024x1024 Interlaced (ALIS) arrays are best with an 1080i signal - and you can argue until the cows come home about them being HD or HD compliant with a 720P signal :)

    Best regards

    Joe
     
  9. dickie

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    May be a stupid question why don't they make 1280x720 panels?
     
  10. Nick_UK

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    I think it may be something to do with the failure rate of the panels. I'm not sure how many faulty panels have to be thrown away - my guess would be about 30% - but I expect they are concentrating production on the popular size panels.
     
  11. hornydragon

    hornydragon
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    JVC do a 4000X3000 PJ using D-ILA far and above HDTV res £2million and £60k for a lens......... used in military apps and fed by a huge computer Sun/SG not seen it but would love too!!!!!!!
    1280x720 LCD/DLP panels are available plasma can be made to any res but at a price..........1024x768 must just fit the GaAs packaging better in a 42" 1366x768 50" are the norm and i think Gordon has seen some high res very large plasmas.... not sure what the res on the 65" panny is but i think it will be 1366x768, hoped for 1920x1080 but looks unlikely
     

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