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can someone explain internal scaling in lcds/plasmas?

Discussion in 'LCD & LED LCD TVs Forum' started by Rob20, Aug 21, 2004.

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  1. Rob20

    Rob20
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    I own Toshiba's wl46 26" lcd screen that has a resolution of 1366 by 768. Obviously if I feed it a dvd signal of 500 lines or so, there's 250+ line difference. How does the screen make up for this shortfall? What about scalers in dvd players like Piooner's 868 that can scale to 720p or 1080i. As I think the Toshiba can accept a 720p picture would the PQ be better using the scaling chip in the Piooneer than in the Toshiba. Hasn't it still got to scale it from 720p to 768p lines?? :confused:
     
  2. jon2099

    jon2099
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    All LCD TVs have built-in scalers as the native resolution of the panel will often not match the resolution of the incoming signal. In the case of an SD signal, this is 720x576 (PAL), which the panel will scale up to its native resolution using upsampling filters. Ditto with the HD resolutions- 1280x720 will be upsampled slightly, while 1920x1080 will be downsampled (in this case you won't be able to resolve the full detail).

    Scalers in DVD players perform the same function. So yes, when you set your player to output 720p, this will then be upsampled (again) by the LCD TV. Whether scaling from 576p->720p->768p is better or straight from 576p->768p depends on how well the scalers are designed. Best to just try it and see.
     

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