As we told you a few days ago, the tracks that we have indicates that the next «flagship» LG will not arrive next week, during the Mobile World Congress. Little more than one week ago the newspaper Korea Times said that the South Korean company present your G4 in April, a fairly credible date that, in principle, we can give for good. However, this mobile is giving much to talk about, and not that we won’t see the light during the MWC, but to your screen.
Our colleagues from Engadget told us a few days ago that you are taking the possibility that LG bet by integrating into its G4 a screen 3 K force. Yes, neither more nor less than 3 K. slope believe it, but there are so many media that have collected this information that we want to take it into account if you really dare to take this step. If it is finally confirmed, the G4 would use a 5.5-inch screen with a resolution of 2,880 x 1,620 points, which is equivalent to a density of more than 600 dpi. Actually does something like Figure?
For 3K at 5.5 inches?
The dots-per-inch density tells us how many pixels can fit in a square inch surface (one inch equals 2.54 cm). If we have a mobile equipped with a screen can get many points in this space, our eyes will have difficulty to perceive them independently, and we will have the feeling to be watching a homogenous and continuous image, and not a group of unconnected points. This is desirable, and, therefore, it is good that we have smartphones, tablets, televisions, monitors and projectors with high resolution.
However, our eyes visual acuity is limited, so some extent from an increase in the density of pixels per inch does not bring anything from a qualitative point of view. Of course, not only matter the resolution of the screen; It is also essential take into account the distance from which we observe it. If we look at a screen from close we will need one resolution greater than if we observe it from several meters away. It is very easy to see this idea.
During the last years have been published a number of studies that have attempted to determine with precision the actual resolution of the human retina. One of them is the one who developed Raymond Soneira, DisplayMate, defending a human retina in perfect condition has a resolution of 0.6 minutes of arc per pixel. This unit of measure relates precisely the spot size and the distance from which we observe it. A much older study by J. Blackwell in 1946, a researcher at the American optical society, sets the resolution of the human eye is very near the 0,35 minutes of arc.
According to Roger N. Clark, of MIT, the human eye under ideal conditions can distinguish a maximum of 530 points per inch
And one of the most recent, by the MIT (Massachusetts Institute of technology) scientist Roger N. Clark, establishes that the human eye can distinguish in ideal conditions a maximum of 530 dots per inch, a very high figure that we can take as a reference, but that, possibly, in real conditions is significantly lower. In any case, let’s compare this figure with the densities of points per inch we are handling. A Mobile 5-inch Full HD screen has a density of about 441 points per inch, less than 530 DPI that, according to Clark, are able to perceive our eyes, but that is possibly according to our acuity in real conditions.
Now let to a 2K display. A smartphone with 5.5 inch panel and a resolution of 1440 x 2560 pixel, as, for example, the G3 of LG, has a density of approximately of 538 ppp, a figure that already exceeds the theoretical limit exposed by Roger N. Clark, and that, therefore, should be more than enough even for the phablets with large screens. And, as we have seen at the beginning of the post, if the LG G4 actually incorporated a 5.5 inch screen with resolution 3K (1,620 x 2,880 points) would exceed the 600 dpi. Assuming good data from the studies that I mentioned earlier, is evident that we do not need such high resolution. And if we simply trust our own intuition and experience offering current phones, we arrive at the same conclusion.
What happens with the battery?
If the increase in the native resolution of the display of mobile phones had no penalty, users would see it favorably. Or give us equal. But has it. We all know that the graphics engine should make an effort significantly greater if you need to process more points to generate each one of the images that we see on the screen of your phone, and this has a clear impact consumption, and, therefore, also in the autonomy, which can be seriously reduced.
With the figures that we have seen before in hand, Full HD resolution is sufficient for much of smartphones on the market, and seems the most balanced choice for screens up to 5 inches. Many take for good also this resolution in 5.5 inch panels if autonomy goes benefited, but if we are rigorous, can accept panels 2K above the 5 inches to meet figures advocating Roger N. Clark. But a screen with 3K resolution seems very difficult to justify, especially if we consider that you can put the battery in very serious trouble. Fortunately, we still hope that all this is not finally confirmed and LG bet by integrating into its G4 a screen similar to the of his G3. With 2K we have more than enough.