Samsung apparently deems the Galaxy S III PenTile superior for an AMOLED screen longevity, despite that it touted the RGB matrix last year in the Galayx S II marketing. We know that blue subpixels deteriorate orders of magnitude faster in an OLED screen due to the nature of their components, compared to the longer-lasting green and red. With recent advancements in the blue diodes, this has been remedied, but on the research phase, and not yet implemented in mass production, it seems.

Samsung research showed that people are keeping phones like the Galaxy S III longer than 18 months, so it wanted to ensure the screen will keep its initial quality as long as possible. The thing is that PenTile uses red-green-blue-green (RGBG) subpixel arrangement in the "screen door"-style PenTile matrix, whereas the ordinary red-green-blue RGB "stripe" matrix has twice more blues, obviously, which you can see in the picture on the right, while the human eye is much more sensitive to greens, so blues are not missed much with PenTile.
Still, Philip Berne said they are using a different PenTile method for the 4.8" HD screen on the Galaxy S III, compared to the 4.6" on the Galaxy Nexus, with shrunken gaps in the subpixel matrix, further minimizing the PenTile "grainy" effect in solid colors when looked at from right under your nose, or, even funnier, under a microscope, both of which you won't be doing anyway with the Galaxy S III.


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