From DailyTech: For the critics of so-called "quad high definition" (QHD) (aka "2K") displays and the diminishing visual returns that come with them, avert your eyes. Japan's Sharp Corp. (TYO:6753) has unveiled a 5.5-inch display for smartphones that bumps the resolution to a mind-boggling 2,160 x 3,840 pixels. That's good enough to make this the world's first ultra-high definition (UHD) (aka "4K") smartphone display.
The density of the display measures in at an incredible 806 pixels per inch (ppi). As with the 4.1-inch, 736 ppi tiny "2K" display shown off last year, the new 4K display leverages Sharp's mature IGZO transparent semiconducting display technology.
The term IGZO refers to the elemental blend used to form the backplane of the pixels -- indium, gallium, zinc-oxide. The special semiconductor is pricier, but has helped sharp hit higher densities faster, as the electron mobility of IGZO is higher than amorphous silicon (a-Si), the cheaper alternative. That high mobilility allows the pixel density gains to keep pace with the die shrinks of the switching transistors.
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