LCD TV is the extra 50MHZ worth £200?

donnajunkie

just to add to what i said. i am sure i have read somewhere that 1080p tvs upscale everything to 1080p. so actually does that mean that seeing 1080i is impossible? well if 768 tvs downscale to 768 and 1080p tvs upscale to 1080p.

Lum

donnajunkie wrote: »

to be honest i dont think i have seen a tv that says it is 720 in the spec it is always either 1366 by 768 or 1920 by 1080 if it is full hd. i see your point about the difference between 720 and 768 but it is harsh to say that all 768 tvs are like cheap pc monitors.
does a 768 tv really downscale a 1080i output back to 768? if that is correct then that will mean you need a full hd tv to get 1080i?

That is correct all LCD and Plasma screens are only capable of displaying a fixed resolution, any other resolution requires scaling to achieve. There is also no such thing as a 1080i LCD or Plasma, they're all progressive scan, even the 768 ones.

To display 1080i on a 1080p is just a (comparatively) simple deinterlacing process, no scaling needed and no lag introduced (well, maybe 1/50th of a second)

It's probably best not to get into the different deinterlacing techniques and the quality / cost of each. I think I've opened enough cans of worms already

Personally I wish that interlacing would just go away, but I understand why they do it. It takes 4 times the CPU power to decode a 1080p signal as to decode a 1080i signal. Sky HD boxes are expensive enough as it is (and sometimes overheat)

aliEnRIK

donnajunkie wrote: »

just to add to what i said. i am sure i have read somewhere that 1080p tvs upscale everything to 1080p. so actually does that mean that seeing 1080i is impossible? well if 768 tvs downscale to 768 and 1080p tvs upscale to 1080p.

1080 tv always displays in progressive. 1080i isnt 'upscaled' to progressive, its 'deinterlaced' (Scaling is changing the size only)
EVERYTHING is viewed in progressive weither its progressive from start to finish or its deinterlaced somewhere along the route