The pixels per inch increases as the screen size shrinks, so the 264 ppi density of the two Pro models and Air 2 is lower than the 326 ppi of both iPad mini models. (cultofmac.com)
The ZTE Axon 7 featured a 5.5 inch AMOLED capacitive touchscreen with a resolution of 1440 x 2560 pixels and 538 ppi density with protection from Corning Gorilla Glass 4. (dealntech.com)
Thanks to a smaller size, the new AMOLED screen offers improved 326 ppi density as well, despite a 390 x 390 resolution that's technically inferior to the 400 x 400 pixels delivered by the 1.39 - inch first - gen version for a 287 ppi count. (pocketnow.com)