The Xperia 2011 series phones I believe uses the backlit LCD display screen.
The Samsung Galaxy S2 phones uses the Super Amoled display screen.
All the pixels of your phone are made up of multi sub pixels. Your phone's resolution (often 800 or 854x480) is measured in pixels.
When you refer to pentile or RGB you are actually referring to the way the subpixels are arranged.
Each of the sub-pixels is for a certain color-- red, blue, or green. On Samsung's Super AMOLED screens, each pixel is composed of 8 sub-pixels. PenTile refers to the arrangement of these sub-pixel elements. Unlike standard screens, PenTile is in an RG-BG arrangement. So you get one-third fewer sub-pixels in total by repeating the green after each red or blue sub-pixel. These screens are easier to manufacture, and we know that AMOLEDs are not easy to make in the first place.
Super AMOLED Plus will change the sub-pixel arrangement to be more in-line with other screen technologies. These screens will use RGB-RGB sub pixel arrangement. So here you get those extra screen elements back. Samsung has decided to brand this "Real-Stripe". Where as each pixel in PenTile is made up of 8 sub-pixels, the Real-Stripe screen have 12 elements per pixel. That's the 50% increase in sub-pixels Samsung has been throwing around. It comes from a comparison to PenTile
The back lit LCD screens like on traditional LCD screens, has three subpixel (Red-Green-Blue) for each pixel. The SE Xperia line uses the back lit LCD screens that have the RGB subpixel arrangement.
or this is just related with the ppi density...
