Home / Opinions / 4K smartphone screens: Why is Sony making a higher resolution phone display?

4K smartphone screens: What is Sony making a higher resolution phone display?


4K screens 9

Sony has officially announced the Xperia Z5 Premium with a 4K display. Some people probably think that's a ludicrously excessive screen to have on a phone. Here are some reasons why it might not be so crazy.

We’ve gone on record in the past to cast doubts over the necessity for QHD displays in modern mobile phones. We loved the LG G3, which was the first example of such a display in a mainstream phone, but were all those extra pixels really necessary?

The law of diminishing returns when it comes to how much detail the human eye can pick out in a small(ish) screen, as well as the resulting hit to battery and processor performance, prompted the naysayers to say ‘Nay.’ As is their wont.

But the QHD resolution found in the LG G3 and the Samsung Galaxy S6 is ‘only’ 2K. Why on earth would we want a 4K display in a phone?

Related: Hands-on with the Sony Xperia Z5 Premium

Watching 4K content on the move

Many people decried the 4K standard in television sets until surprisingly recently. Besides cost, the primary reason for these complaints was the simple fact that there was hardly any 4K content out there to justify such a technological leap.

The reason these dissenting voices have quietened in recent times is because that situation has changed.

4K content is trickling through on popular streaming services like Netflix and YouTube. WHat’s more, 4K Blu-ray players are set to start appearing by the end of the year (keep your eyes peeled during IFA 2015 from September 9).

Put simply, 4K content is here. With more and more people watching video content on their smartphones, a 4K smartphones simply makes sense.

Related: Ultra HD Blu-ray: All you need to know about 4K Blu-ray

Xperia Z3+

Smartphones can shoot 4K video

Talking of 4K smartphones, does it strike anyone else as odd that smartphones have been able to shoot 4K video for two-and-a-half years now, yet we’ve been unable to watch such videos back in their native resolution on the very devices that shot them?

The availability of the Snapdragon 800 CPU in early 2013 brought 4K video capture to smartphones, but it’s always felt like a curiously half-baked function to us.

From a film maker’s perspective, then, smartphones that can output 4K natively sound a lot less like a needless gimmick, and more like the belated completion of a feature.

Related: Project Morpheus hands-on

4K screens 7

Virtual Reality

The argument with very high resolution smartphone displays is that you can’t really notice the extra detail that they provide. Anyone who’s used a smartphone-utilising virtual reality headset like the Samsung Gear VR will tell you otherwise.

Even with a relatively compact 2K smartphone like the Samsung Galaxy S6 inserted into the headset, there’s visible pixellation on display.

The fact that the handset is positioned so close to your eyes means that you really can pick out the pixels - and this lack of sharpness can lead to the spoiling of the immersive VR effect, and even nausea.

If you’re at all interested in the future of VR, and particularly Samsung’s and Google’s inclusive take on it, you should be wishing for a 4K smartphone to come along sooner rather than later.

Viewing your high res photos

Even when it comes to holding your smartphone at arm’s length during normal usage, there is one particular popular pastime that would benefit enormously from going 4K.

We’re talking about looking at photos, of course.

Viewing snaps on your phone is a necessarily compromised affair - at least when those snaps are of a high quality. Which, given the standard of modern flagship phone cameras, they often are.

A 4K display will mean you’ll be able to get a truer impression of high quality images without having to zoom and pan so much.

Related: What is HDR TV and should you care?

4K screens 5

It's cutting edge tech

Ultimately, a little part of us just wants smartphone manufacturers to push the boundaries of technology because it’s cool. Because it’s exciting. Because they can.

For all of the protestations over the necessity of very high resolution displays (some of which has come from us), that’s kind of how this crazy industry works. Manufacturers come up with new box-ticking features of dubious immediate value, the rest of the field follows, that feature gets refined, it becomes vital. Eventually, it becomes normal, and the cycle starts again with something even bigger and better.

Remember when the iPhone 4’s Retina display came along? That was as sharp as smartphone displays needed to be, we thought. Things move on.

At the very least, as we’ve shown with the preceding four points, there will be genuine long term benefits to a 4K smartphone display - even if, in the short term, it might mean being tethered to a wall charger several times a day.

Do you think we need 4K screens on a smartphone? Let us know in the comments section below.


September 2, 2015, 8:27 pm

it's nuts.


September 3, 2015, 2:20 am

Its genius because pushing technologies boundaries means whats gone before often becomes better value for money. In this case though 4k phones are silly really it probably means decent full high def phones will become available at real budget prices.

John A. Rupkalvis

April 13, 2016, 12:34 am

They really should be 8K at least. The "screen door effect" can still be seen on 4K displays with most current virtual reality viewers. You should not be able to see individual pixels for good VR.


March 15, 2017, 4:46 pm

If you use a Gear with an S7 you know immediately why a 4K phone is needed now, and why the first maker with an 8K will rule the world. Ultimately, I expect one day to buy a low cost courtside Wimbledon ticket, and watch on a superlight 16K headset. 5 years? VR is going to go WHOOOOOOSSSHHH!


March 15, 2017, 4:48 pm

That's interesting. How exactly have you viewed 4K VR?


March 15, 2017, 4:58 pm

I'm currently using an S7 Edge with a Gear VR. It's terrific, with tons of stuff of varying qualities, which is being improved and added to all the time. But it's all limited by the 2K display. Far from being silly, a 4K display will be the essential next step to drive VR forward. I'd dump my S7 in a heartbeat if the S8 is 4K! Sony are one of the first, and I think we'll soon be hearing about a class-leading VR headset with the Sony logo on it.
Roll on 8K!

Michael F

May 8, 2017, 4:35 pm

The "screen door" effect has little to do with the size of pixels or how many there are, but with how far apart they are. A 720p display with larger pixels with smaller gaps will look better than a 4K display with large gaps between pixels. Just go to a Best Buy or Walmart and compare the 1080p Sony, Samsung, LG, or Sharp TVs to the 4K Toshiba, Westinghouse, or TCLs.

Michael F

May 8, 2017, 4:41 pm

The S7 doesn't have a 2K (aka 1080p) display, it is 2.5K (aka QHD or 1440p). I understand that so many people mistake it because most tech journalists don't seem to care to get it right.

comments powered by Disqus