While squeezing 440 pixels into each inch is an impressive feat, it might be a moot point, good for little more than bragging rights, for the average consumer. As Tech Crunch reports, the human eye is mostly incapable of discerning the finer intricacies of displays exceeding 300ppi, depending on viewing distance. To put all these numbers into perspective, the 4-inch screen on Apple's iPhone 5 has a 326ppi display and LG's Nexus 4 comes equipped with a 4.7 inch, 300ppi display. The larger the screen, the lower the pixel density, so Samsung's 440ppi display might be well-suited to the Galaxy S IV's 5-inch screen.
The pixel display arms race is rapidly approaching and, in some cases, exceeding the limitations of the human eye, which means that for every instance of one-upmanship, consumers can only nod sagely while simply accepting that their display is better than the next guy’s. With Sony and HTC announcing their own 440ppi smartphones – the Xperia Z and the Droid DNA respectively – it doesn’t look like the battle for incremental victories in display dominance is showing any signs of slowing down