During Samsung's Analyst day, held not too long ago, the Korean company was heard boasting of 560+ppi display panels in the near future. A leaked slide from a presentation made by the CEO of Samsung Displays hints that the next-generation Galaxy S5 will sport a 5-inch+ sized display, and that ain't the juicy bit. CEO Kinam Kim clearly mentions in slide number 11 of his presentation that 560ppi panels are slated for 2014, and that a 5.3-inch sized version with a display resolution of 2560 x 1440 (WQHD) of SuperAMOLED make is already ready for deployment next year. Now, last time we checked, Samsung was climbing up the ladder when it came to display size on the Galaxy Note series, leaving the Galaxy S5 to be the (one and) only candidate that might feature such a high-resolution display.
Having said that, do we really need such high pixel densities? Or should display technology companies focus on producing more energy efficient panels (look at Sharp's work with IGZO for instance) that can enhance a Smartphone's longevity (since battery technology is obviously not evolving fast enough). One thing is for sure, when the Galaxy S5 does arrive, it will beat the Vivo Xplay 3S with a 5.5-inch WQHD panel to take the crown for the Smartphone with the highest pixel density.
Hit the source link to check out the presentation in PDF format.