This article is a mess. First of all, iPhone 4's 300 "pixels" per inch actually comprise three color sub-pixels each. Most display drivers today can use the c

This article is a mess. First of all, iPhone 4's 300 "pixels" per inch actually comprise three color sub-pixels each. Most display drivers today can use the color sub-pixels to carry spatial as well as color information, so that would bump the performance of this display comfortably over the detection threshold of the human eye. Second, the throw-away comment that "magazines are printed at 300 dots per inch" is incorrect and mis-leading. Dots are not the same as pixels, a printed dot is either "on" or "off". A magazine printed at 300 dpi has a substantially lower actual resolution than a 300 pixel-per-inch display that can render 18-24 bits of color at each pixel. Finally, as others have mentioned, the slamming of Sharp's Quattron technology is wrong-headed. Adding a yellow pixel can significantly increase the color gamut of an LCD display, since in many cases the color resists used to make the RGB color filters do a particularly poor job of producing yellows.