Re: LCD TV Resolution Question(s)


"Ben" <nospam@xxxxxxxxxx> wrote in message
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Simon Chambers wrote:
"Ben" <nospam@xxxxxxxxxx> wrote in message
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Simon Chambers wrote:
I have an LCD monitor for my computer, and if I use it at a lower
resolution
than it is capable of the display is fuzzy as it "expands" the picture
to
fill the screen.

Why then, given that UK TV broadcasts in 625 lines, is the typical
resolution for an LCD TV 1024 * 768 for 4:3 or 1368 * 768 for 16:9?

Surely this will result in a picture that is not as sharp as it could
be?
LCD monitors are only designed to work at one resolution, feed them
anything else and they don't work properly. A better analogy is when
you
resize a window on your PC, for example when wiewing a photo or playing
a DVD. You can make the window as big or as small as you want, or
expand
it to full screen, and there's no way you will be able to tell by
looking whether the image happens to be at its native resolution rather
than slightly larger or slightly smaller, because it looks exactly the
same.

I don't understand your analogy. The point I made was that LCD monitors
only
work properly at one resolution and give a fuzzy picture otherwise. So
why
would you buy a TV with 768 lines when the broadcast picture is 625 (or
576
or whatever) lines as this builds in a fuzzy picture?

For example, my Apple 20 inch widescreen monitor is 1680x1050 pixels. If
I start playing a DVD then grab the corner of the window and pull it in
or out I can resize the window to any resolution. Now, if you are
correct that native resolution is visibly better then by resizing the
window to higher and lower resolutions you should be able to find a
'goldilocks' point at which the picture looks just right, and when you
check you should find that this resolution is 1024x576. Its not there,
it doesn't exist, you will be completely unable to tell when you have
hit upon the native resolution of the image. My point is that you don't
need to get hung up about native resolutions. A 576 line picture
displayed using 576 lines looks indistinguishable from a 576 line
picture displayed using 575 or 577 or any other number of lines. Try it
yourself.

My experience of video on computers is that if you fill a large screem you
DO lose quality, but I'm not talking about windows on computers. The monitor
example was an illustration that most people would be familiar with on what
happens if you ask an LCD with 768 lines to display a picture with (eg) 600
lines.

You're not comparing the same thing. If you change you computer's resolution
to (say) 1368 * 768 you will see the entire displayed picture is fuzzy and
not sharp. That is the effect that I am assuming will also be present on LCD
TVs.


Whats more, I understand that HDTV will be 1020 lines(?), so surely
even
the
so called HD ready LCD TVs will not be capable of fully displaying and
HD
picture and will be fuzzy as the "shrink" the picture? Or have I
missed
something here as well?
Its 1080, not 1020. The actual vertical resolution of 1080i is about
the
same as 720p anyway, so you won't be missing much

So are you saying that an HD picture only has about 720 lines of
picture?
Hardly a massive improvement over the current 576.

Yes it is an improvement, because standard definition is also
interlaced, so 1080i is better than 576i, but 1080i is only marginally
better than 720p


.

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