Serif Fonts Acceptable on Smartphones

Serif fonts, like the Times family, look great in print, but not so great on computer monitors. That is because even very good monitors pixel density falls far short of the minimum print standard of 300 dpi. I have noticed, though, that Times looks just fine on my Vibrant smartphone, whose pixel density very closely approaches 300 dpi. I imagine the same is true of the iPad, though in a much larger form factor. I think that, almost as much as the form factor, helps explain why the iPad has been such a successful reading platform. Same for Kindle, sans color.