Then, quickly we jumped to HD displays with a resolution of 720 x 1280 pixels, the seemingly last and final stop in a pixel journey.
It was far from over, though: in late 2012, HTC unveiled the elusive J Butterfly, the first phone with a 1080 x 1920-pixel display and a pixel density of the immense over 400ppi.
Fast forward to 2014 and LG first stepped into Quad HD (1440 x 2560-pixel) screen territory with the LG G3, and the others quickly followed.
And just when we thought it was all merrily over and there is no practical reason to go beyond that super high resolution, news comes in that Sony is expected to unveil the first phone - its Xperia Z5 Premium - with a 4K Ultra HD (UHD, or 2160 x 3840 pixels) screen. Yes, that's pixel density of over 800ppi. And true: all of this is happening while laptops are still sold en masse with a 1366 x 768-pixel resolution, aka pixel density of around 100ppi. There's all sorts of reasons for this (first and foremost is the fact that the phone market is multiple times bigger than the laptop market), but it still seems like a ridiculous absurdity of modern life.
We are certain that you will hear a lot of marketing mumbo-jumbo in the forthcoming days and months, so that's why we want to ask you now, before the hype: do you really want/need a 4K display on a smartphone?