Sony: Z5 Premium only renders media in 4K, the rest in 1080p for a two-day battery
At the time, most comments on the matter argued that this actually makes sense, as rendering a 4K interface around would place unnecessary strain on the graphics subsystem, leading to Snapdragon 810 performance slowdowns, and/or a battery life hit. These can be easily avoided by enabling 4K only where it matters most - in the camera/gallery, and during video playback and upscaling.
Well, now we have Sony's first official statement on this pressing 4K matter, and they explained to us exactly why the company went with the 4K-on-demand concept for their seasonal flagship:
Xperia Z5 Premium features a 4K display with a resolution of 3840x2160 pixels based on SID Standard and enables all video and image content to be enjoyed in 4K resolution. All other content is displayed at 1080P or lower resolution in order to optimise the performance and battery stamina for this device, ensuring you can enjoy the 4K resolution when you need it most.
Just like the Z5 and Z5 Compact, the Z5 Premium is still listed as a "two-day battery" phone in Sony's feature sheet, despite its jaw-dropping display resolution, and now we know how Sony managed to pull this off. Granted, it has a larger battery than those two as well, but running the display in 1080p most of the time, and only firing up on all 4K cylinders when rendering video or images in such ultra high definition, contributes to having the battery stamina Sony's phones are now acclaimed for, despite sporting a display with record pixel density. There you have it.
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