You can cross another resolution off the smartphone display list:
The third device from the Z5 series is the Xperia Z5 Premium, which includes the 5.5" 4k [3840×2160] screen, a 3,430 mAh battery, and the ability to expand its 32 GB of default internal storage by up to 200 GB through microSD cards. The 4k Triluminos IPS display promises to have a high color gamut, higher contrast and higher sharpness, as well. In the few moments I've spent with it at IFA, the screen did indeed look crystal clear.
[...] Xperia Z5 will launch globally in October this year, while the Xperia Z5 Premium should arrive a month later, in November. Both single-SIM and dual-SIM variants will exist for both models.
Some lucky Sony executive is shoving the Xperia Z5 Premium in his Google Cardboard. Next stop, the world's first 5K (5120×2880) smartphone.
(Score: 0) by Anonymous Coward on Friday September 04 2015, @10:51PM
It's all about having less pixels to power and light up, not about scaling. The screen is the most power-hungry component of your phone. Unless the people on the Android forums were swapping their displays out with lower resolution screens, they are still lighting up the same number of pixels.
(Score: 0) by Anonymous Coward on Friday September 04 2015, @11:50PM
Yes, more pixels means more light, unless they've somehow found a way to make the pixels smaller. Which, since the screen measures a whopping 5.5", they clearly haven't.