Display - PenTile begoneA lot of people were hoping that Samsung would move to a non-PenTile screen for the Galaxy Note II and the Koreans delivered. They changed other features of the screen too, like the surface on top, which is now Gorilla Glass 2.
Also, the diagonal grew to 5.55" (up from 5.3") and the aspect ratio changed - the Galaxy Note II uses a 720p screen (16:9) instead of WXGA (16:10).
What this amounts to is a taller, narrower screen (and consequently taller, narrower device) and a slightly increased surface area - the Galaxy Note II screen has about 2% more surface area than the original Note.
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The brilliant screen on the Samsung Galaxy Note II
The removal of that 80-pixel wide strip resulted in a slightly lower pixel density - 267ppi vs. 285ppi. The new matrix, however, makes up for that easily and the perceivable sharpness of the screen is actually higher.
It's no longer a PenTile matrix like on the original Note (which had a slight crosshatch patter noticeable, but only if you look really closely). Perhaps these photos snapped with a digital microscope will help clear up the differences in pixel arrangements.
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Samsung Galaxy Note screen • Samsung Galaxy Note II screen
The pixels of the Note II have one tall Blue sub-pixel on the left and smaller Green and Red pixels stacked one on top of the other. It's an odd arrangement, but it has three subpixels per pixel. The reason for the different Blue pixel is that Blue AMOLEDs typically have a shorter life and making them bigger balances things out. Also, the Blue pixel doesn't shine as brightly, which also improves its life, but doesn't affect color balance (because it's bigger).
To illustrate how the different arrangement improves sharpness we used our microscope to snap a picture of very tiny text - the line width here is 1px, the font is white.
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Samsung Galaxy Note screen • Samsung Galaxy Note II screen
As you can see, the Galaxy Note II screen lights up individual pixels to display the 1px-wide lines. The old Galaxy Note, however, can't use a single pixel as each individual pixels can't make white, as it only has two of the three needed colors.
To fix that, the screen uses sub-pixel rendering, which "borrows" a subpixel from a neighboring pixel to make white. But now the line has become 1 2/3px wide.
This new arrangement seems to result in some very slight color aberrations around sharp edges, but it takes a great deal of eye-strain to try and see it.