For well over a decade, smartphone manufacturers marketed screen resolution and pixel density as the be-all and end-all of display quality. Even today, you’ll find a handful of flagship smartphones like the Sony Xperia 1 IV and Galaxy S22 Ultra tout their 4K and Quad HD (QHD) displays as key selling points. However, a lot has changed since QHD and 4K smartphone displays first debuted in 2015, a time when 5.5-inch screens were the norm.
The Samsung Galaxy S6 Edge, one of the first smartphones to feature a QHD display, had a pixel density of nearly 580 pixels per inch (PPI). This year’s Galaxy S22 Plus, however, doesn’t even top 400 PPI, due to its lower FHD-class resolution and a larger 6.6-inch display.