Native resolution for a given screen size

Everything I have read says that TFT-LCDs have the same pixel count for a given screen size. Foe example, a 15" screen has a pixel count of 1024 x 768; a 17" screen has 1280 x 1024. These are the 'native' resolutions.

But yet, Dell is advertising TFT-LCDS of the same screen size with different native resolutions for the same screen size!

http://www.dell.com/us/en/dhs/learnmore/learnmore_screen_notebooks_popup_inspn.htm

Anybody have any idea how to reconcile this seeming contradiction? Could it be that the claimed 'native resolution' of 1400 x 1050 for one of the 15 inchers is in fact not the native res, but what the monitor is capable of extrapolating?

Thanks,

-Bob
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  1. Those "standards" if you can call em that (pro monitors go beyond these standard res, but let's keep it at normal consumer level for now) apply to desktop monitors primarily.

    Hilbert space is a big place.
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