720p & 1080i

Discussion in 'LCD & LED LCD TVs Forum' started by tonyk01, Dec 19, 2006.

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  1. tonyk01

    tonyk01
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    Hi guys

    Can someone please clear this up for me.

    I have a samsung LCD and currently have set a 720p custom reslution to 1200 x 668 so that the screen fits and is readable. Just out of interest I have also tried a 1080i custom resolution for the same reasons, but it doesnt make any text readable.

    Anyone one know why?

    Thanks
     
  2. PeteD64

    PeteD64
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    Are you talking about hooking up a PC here?

    At a guess I'd say it's because the native resolution of your screen is closer to 720p, a lot are 1366x768.

    With 1080i you're sending 1920x1080 to your TV but because it's an interlaced signal each frame will be split into 2 lots of 1920x540 (odd & even lines). Your TV then has to de-interlace the image & rescale it to it's native resolution.

    Also how is your PC connected to the TV? If it has a VGA port it would be worth trying that. Pretty sure most Samsung sets will accept 1360x768 resolution thru VGA will look very sharp & there's no overscan to worry about.
     
  3. mutantbigman

    mutantbigman
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    Why use a custom resolution?

    Just use the native resolution. My pc looks amazing on my samsung 32"

    Hd downloads look amazing.
     
  4. RockySpieler

    RockySpieler
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    Sounds like OP is using HDMI connection. And then using the overscan correction to get 720p to fit the screen.

    As suggested by others VGA is probably the best option on a Samsung.

    The 1080i text would be elligible because it would be smaller than the screen's native resolution, and the TV would be trying to scale (squash) 1000 ish rows (overscan correction estimate) of PC pixels into 768 actual display pixels rows. They cannot possibly line up and text becomes unreadable.
     

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