how determine total sq. inches (mm) on LCD monitor?

Question

so a 22" widescreen that is 1680x1050 VS a 20" 1600x1200......if i simply multiply the numbers, i get 1764 VS 1920 ....is this correct way to determine the actual 'real estate'...by this method it's telling me that there is more total screen on a 20" regular monitor than a 22" widescreen.

well, i guess i can just multiply the actual inches they give on spec pages, minus bezel width....it's pretty obvious why they don't include actual screen sq. inches in specs, otherwise people would realize wide-screens arn't actually that much bigger.

ex.: Samsung 204b VS 225BW, including bezel, HxWdimensions are 294" VS. 320", so you only gain 26", not a lot %-wise! but pitch-wise the 20" is much better: .255 VS. .282 . seems like most 22" screens are all .28 pitch unless you spend a LOT more.

Answer 1

its not necessarily more physical screen but digitaly....
the 20" can just display more pixels. pixels are dots with no real size, kind of like how an electron has no real weight. so the 20" has smaller and more pixels so your display can fit more stuff at the cost of smaller icons, pics, text, etc

Answer 2

No, for this to work each screens LED to LED distance would have to have the same measured vertically and the same measured horizontally. There is nothing to prevent a manufacturer to make the pixels smaller to increase screen resolution or larger to reduce costs. HDTV sets have 1366x768 regardless of screen sizes. HDTV sets have an aspect ration of 4:3 but 1368/768 is not equal to 4/3.

For a widescreen monitor (4:3 aspect ratio= W/H)

DL= Diagonal length H= height of rectangle W= width of rectangle
W= 4/3 H
DL= Square root ((H*H)+(H*H*16/9)) = H*5/3
H= (3/5)*DL W= (4/5)*DL
Area = H*W= (3/5)*(4/5)*DL*DL = (12/25)*DL*DL

20” Area = 192 sq.in
22” Area = 232.3 sq.in.

Answer 3

Typical method is to multiply height by width in mm/cm/inches to find the square mm/cm/inches of "real estate". However i just posted a question about resolution...which you may need to consider? What is your goal here. are you looking for more space to have applications? Keep in mind LCD screens come in varations (See http://en.wikipedia.org/wiki/WSXGA_Wide_XGA%2B) as an example. Are there concerns about distortion in graphic arts (pictures)? Hope this helps.