Still, it seems that 4K is coming and it may be a mainstream thing, too, instead of an extravagant feature for a limited amount of phones. Sure, when we first heard about Sharp readying up a 4K phone display panel, that didn't mean that the rest of the industry will be so quick to follow. But now, Qualcomm has stepped up to back the 4K movement, and claims that it firmly believes that Ultra HD resolution (3840 x 2160) will be the pixel count of choice for 2015's premium smartphones.
But what is Qualcomm's reasoning? Well, first, the company does not entirely agree with the "Retina Display" concept, in a sense that it believes that the human eye can actually discern pixels, at a 10-inch distance, with densities much higher than 300 PPI – up to 573, to be exact. Then, there is "vernier acuity" – the human brain's ability to distinguish the relative alignment of two line segments. Vernier acuity allows the mind to perceive an offset between two line segments, even if said offset is smaller than a single retina photoreceptor. In other words, as screens get more pixels, we won't be able to "see" the images getting sharper and more detailed, but should "feel" them to look better. Furthermore, UHD may be overkill on a 5” screen, giving it a staggering 881 PPI, however, on a 10” tablet, it will result in 440 PPI, which, while still pretty high, isn't something we are not used to seeing on today's QHD smartphones.
Aside from the screens, Qualcomm also believes that smartphones need to have a natural 4K resolution for yet another reason – interconnectedness with high-quality TVs and monitors. Since 4K video capture on smartphone cameras is now a thing, and its availability is only expected to increase, it's natural to expect that, in the near future, a lot of user-generated media will be in UHD. This will, in turn, drive the adoption of 4K for all types of screens to slowly take over the consumer device ecosystem, and it would only make sense to not exclude the smartphones from said ecosystem, and give them the same resolution screens.
At least, that's what Qualcomm's reasoning is. What's your take on that?