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just wondering, what's more important: horizontal dot pitch or vertical? >>
The vertical dot pitch is not as important as the horizontal dot pitch. Some may argue that the horizontal dot / aperture pitch limits the horizontal resolution on the display. To a degree this is true.
For example: A 21" monitor typically has a horizontal viewable area of 395mm. Lets assume it has a 0.22mm horizontal dot pitch. 395 * 0.22 = 1795 dots across the screen. A monitor with the same viewable area and a 0.24mm horizontal dot / aperture pitch has 1645, limiting its highest end resolution capability.
Vertically is not so much a problem. A typical 21" monitor has a vertical viewable area of 295mm. Aperture grill monitors have a 0.00mm vertical aperture pitch. Vertical resolution capability is virtually unlimited. As with every technology the trade off is more beam current hitting the phosphor making them more susceptible to screen burn. Use a screen saver!
Most shadow mask monitors have a 0.14mm vertical dot pitch. 295 / 0.14 = 2107 lines far more than any video card can produce at any decent refresh rate.
For more information on dot / aperture pitch look
here
Good Luck
Jim Witkowski
Chief Hardware Engineer
Cornerstone / Monitorsdirect.com