I'm finding it hard to get my head around this. When you say two screens are 10 inches tall, one is 16:9, the other 16:10, sure, the 16:9 screen will be bigger because each "unit" would equal 1.111....inches, whereas each unit for the 16:10 would equal one inch. So obviously the 16:9 screen is wider because its 16x1.11111.... inches wide, and the other screen is 16x1 inches wide. What you are saying is not entirely correct because you are using 2 different scales. Unit for unit, a 16:10 is bigger. What you are saying is, in essence, like saying a 42inch 16:9 tv is bigger than a 32inch 16:10 tv. Sure it is, but only because each unit is bigger on the 42inch (roughly 1 unit=2.5 inches) than on the 32 inch (1 unit~2inchs).
What i'm trying to say, and it's hard to say it clearly, is that when you have a 16:10 screen and a 16:9 screen which are in the same scale, the 16:10 inch screen is always bigger.
Sorry for the rant. I'm even confusing myself!
the problem is you're using the diagonal measurement - that's where you're getting tripped up.
"unit for unit" 16:!0 is only bigger (taller) if they have the same WIDTH. you can't compare ANYTHING off the diagonal measurement.
It is possible that 16:9 and 16:10 can be exactly the same area if you used different but similar height and width, making the 16:9 just a bit wider, and the 16:10 just a bit taller but they'd have exactly the same overall area. Your naked eye would probably not be able to tell the difference.
The only way to conveniently compare is if one of the measurements, either height or width is fixed. This is what I have been doing to illustrate my point. If that is case than one or the other will be larger (either taller or wider)
My point is not that 16:9 is bigger, but that it CAN be sometimes.
You can't compare a '17" 16:9' to a '17" 16:10' and say the 16:10 is always larger because you don't know if they're rounding one number or the other. The panel sold as a 17 inch could really be 17.3 inches or something and thus be the same height as the old 16:10 panel and you're getting increased size in width without sacrificing any height.
the only way to tell the actual physical size and know if you're losing or gaining space is to do the math: measure both panels, width x height = area.
whichever has the larger area is larger - and it could be 16:9 or 16:10. you can't know until you have both to compare.
The point of this is that if it is more economical to get 16:9 panels because that is the uniform ratio for HDTV and not a specialized ratio, then I hope that manufacturers move to 16:9, because it will mean a savings all around - but so long as they do this by keeping the 16:9 panel the same HEIGHT as the 16:10 panels, we'll actually be getting bigger screens
now what's wrong with that?