xoyo said:
Thank you very much for your help, and I'm sorry for not making this
clear.
The main purpose is to demonstrate some simulation experiments to
visitors, my boss wants it to be large enough so he and a few (two?
three?, not many) guests can stand in front of the display while he
explains the experiments to them.
It needs not to be like a formal presentation, in which case we can use
a projector.
The display is kind of static, not highly dynamic.
The major issues I think may be resolution (when input is from PC),
viewing angle, and weight.
OK, now I think we may be able to help a bit.
The biggest difference between plasma and LCD at this size will
be resolution and cost. In the 40" range, the highest-resolution
plasma display that will be readily available will be something
around a wide-XGA, or about 1366x768 pixels. LCDs will
be available in either this format or the "full HD" 1920 x 1080.
So if you really need to display in the "highest resolution" possible,
you'd have to go with the LCD.
For typical products of both types in this size range, plasma will
still most often have a slight edge in brightness, contrast, and
viewing angle, although the LCDs are catching up very rapidly
on all counts. Plasma will also still have the advantage in cost,
but will be significantly heavier and thicker, and will require
more power.
Only my personal $0.02; I'd recommend, at this point, that you
get to a dealer who has both types in the desired size range,
and do a side-by-side comparison with the sorts of images
you'll be most interested in (take your own laptop as a source
of "PC" images, if you like).
Bob M.