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Why don't lcd tv's stick to 1280/720 or 1920/1080?

Discussion in 'LCD & LED LCD TVs' started by Rob20, Jan 19, 2005.

  1. Rob20

    Rob20
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    As these are the 2 main hi-definition formats, why aren't all panels either 1280/720 or 1920/1080? What's the point of having a 1366/768 tv as you'll always have to scale the picture. :confused:
     
  2. Mr Fujisawa

    Mr Fujisawa
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    thats something ive been wandering too

    anyone got any answers?
     
  3. Member 55145

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    its because the first two are ntsc standards, the last is an emerging pal standard.... well as far as i can tell

    Edit: oh actually I stand corrected 1366x768 is the WXGA standard
     
  4. Rob20

    Rob20
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    WXGA? something to do with pc screens? :confused:
     
  5. jimsan

    jimsan
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    I don't think there is any grand plan here. I think the extra size may be to allow, for example, a full 720p picture to run with the option of some other extra data to be shown too. Sort of Teletexty.....(?)

    Either that or somebody in Japan knows something about future HiDef transmissions that we dont. Anyway, 720p only leaves a very small black outline. Not ideal, but quite watchable.

    Jimmy
     
  6. ianh64

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    It is a legacy of PC displays. 1366x768 is the 16:9 widescreen version of the 4:3 PC XGA 1024x768 format. So they have basically taken a PC display, and stretched it for widescreen. Hence W-XGA.

    Most displays will beable to scale standard video resolutions to fit if required. ie upsize 720p, downsize 1080i.

    -Ian
     
  7. Bob Todd

    Bob Todd
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    I think for a future LCD to support properlly both HDTV and PC based work, the GFX card company's have to push HDTV compatibility in PC based apps, my nvidia gfx card will output HDTV signals, yet the Nvidia nstant media app that comes with the NVidia DVD decoder will not support the 1368x768 resolution I pass to my Sharp panel, saying that I cant actually pass my LCD a natural 1366 res, so its abit of a mish mash right now.

    we need conformity.
     
  8. Rob20

    Rob20
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    What about 1280 by 768?
     
  9. Yaka

    Yaka
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    its an awkward lagacy of pc lcd screens, but its looks like pc based widescreen monitors are going to be 16:10 form which is perfect to deisplay 2 A4 sized windows side by side.
     
  10. richjthorpe

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    1280x768 is a 15:9 format that LCD manufacturers came out with in the previous generation of LCDs. God knows why.
     
  11. AML

    AML
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    I think makers are now realising that most people will be buying new panels (LCD/Plasma) with technologies like Blu Ray and HD-DVD in mind and not PC conectivity.

    Its just a matter of time before all new panels support propper hi def resolutions.

    Im pretty sure that SHARP's last LCD TV (45") supports full HDTV specs. (1920X1080)
     
  12. Rob20

    Rob20
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    Yep, the Sharp is the only flat panel tv in the UK that supposrt 1920/1080p as far as I'm aware. DVI hdcp compliant as well I think. If only I had a spare £5k. :laugh:

    Still, hopefull in a few years that resolution will be the standard. Especially when the newer tv formats start to be released;SED, LED, LCOS etc....
     
  13. richjthorpe

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    I think that all the LCDs at the moment can support 1080......it's just that they can show it and it gets scaled down.

    Richie.
     
  14. Bob Todd

    Bob Todd
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    yes the app works at this resolution
     
  15. Reiner

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    1366/768 is correct, too, as it corresponds exactly to 16:9, thus you do not need to scale the picture.

    Yes, and so do the Samsung 70" plasma or the Mitsubishi's 82" LCoS RPTV.
    More (new) models have been shown at the CES, so 1920x1080 is getting more common, in particular for really BIG screens.

    BTW: 1920x1080 is also called WUXGA.
     
  16. ianh64

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    Im assuming that 1355 is a typo, but whilst 1366x768 is exactly 16:9, since it is not a commonly recognised video standard, like 720p and 1080i/p, you will still need to scale the picture to fit - the aspect ratio will however remain constant so for 16:9 material, no cropping or distortion will be necessary.
     
  17. Rob20

    Rob20
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    What would a 1280 by 720p signal look like on a 1920 by 1080 set? There's a lot of scaling to be done. Or a 480p dvd signal for that matter?
     
  18. Reiner

    Reiner
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    You are right on both counts, must have been a moment of mental blackout. :blush:
     
  19. jgrg

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    The Sharp only does 1080i. You can't drive it at 1080p, even via the DVI socket. Thus you can't use it as a 1920x1080 PC monitor. (And there is enough bandwidth in single link DVI-D for this resolution - it is just the transceiver on the Sharp that can't handle this signal.)

    James
     
  20. jgrg

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    I think they thought that it would be more compatible with common display modes from PCs that are 768 pixels high. But now we've ended up with 1366x768, which is difficult for many graphics cards to drive, and almost all will cards do 1280x720 with no problem. Nnngh!

    James
     

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