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Originally Posted by Anchoku
Pixels are generally square, or very nearly so. The panel is 640 x 480. Divide one by the other and you have 1.33 or 0.75, meaning the panel has a 3:4 aspect ratio which is a common format.
Regarding trigonometry, remember there's such a thing as a 3:4:5 triangle. That makes things remarkably simple: the panel is 3" x 4". Dot pitch, or lines per unit length, is # pixels / # length.
640/4" = 480/3" = 160 dpi
You'll need to hold it 12" or less from your face to see all the detail depending on the quality of your eye sight. That's pretty good, or pretty bad depending on whether you use bifocals.
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Thanks for the wonderful explanation, Anchoku. I never got it quite right with calculating dpi. How did you come up with the 12" viewing distance?