Mobile Display and Resolution: Does it make sense 2K five inch screens?
2K screen smartphones, or better expressed, 1.440p, are about to land on the market. The edition of this year’s Mobile World Congress, the specialist world’s biggest mobile event on February 24 in Barcelona, and many specialized blogs have predicted that some manufacturers use the occasion to unveil its first smartphones with screen 2,560×1,440 points.
However, the arrival of a new batch of products does not guarantee that they can actually improve our user experience. And we are all aware that the image quality of Full HD screen smartphones is very high, so, do we really need a even higher resolutions screens that do not exceed 6 inches? Going to see it in detail.
As you know, the resolution of an image display device, which can be a screen like the TVs, smartphones or tablets, or projector, indicates the number of dots that make up the image. This pixel count is expressed as the product of the number of columns per row, so a Full HD screen will have 1,920 columns and 1,080 rows, which makes a total of 2,073,600 pixels (1,920 × 1,080), equivalent about 2 megapixels.
A screen with more resolution than one of the same size will offer a greater level of detail
Furthermore, the density of dots per inch indicates how many pixels fit in an area of one square inch (one inch is equal to 2.54 centimeters). The more points we introduce in this space, the more difficult will our eyes to perceive them independently, so we have the feeling of watching a uniform image, and above all, continuous, and not a set of disjointed or disconnected points.
Logically, to introduce more pixels in the same space is necessary to reduce the size of each of them, and, if possible, also the space between them. This need is evident as one of the great “workhorses” of the panel manufacturers, and the reason why it is not easy to increase the resolution of the products that reach the market.
In any case, once I made this simple overview we can understand without difficulty that a screen with higher resolution than one of the same size we offer a higher level of detail. And, for this reason, our brain, which is the body that interprets the image really ‘captured’ by our eyes, may more accurately compose that have more information.
You know what resolution are your eyes?
To find out whether it is worthwhile to spend our money on a smartphone with more resolution than the one we are currently using must know beforehand what capacity does our visual system to perceive when the detail of the object we are looking at. Or, what is the same, what resolution have our eyes. Because if we will not see any difference in quality between a smartphone screen 1080p, and another with a 1.440po top panel, why should we bet on the latter, if this were the only major difference between the two?
IPhone 5 should have a few pixels between 40 and 65% smaller to reach the limit of the human eye perception
Interestingly, the ability to perceive details of our eyes is much higher than most of us realize. What matters here is, first, the pixel density of the screen you’re watching, and on the other, the distance at which we observe. Experts believe that mobile devices put our smartphones and tablets at a distance from our eyes that is usually between 10 and 12 inches (25.4 to 30.48 cm).
The first company to commercially used the analogy of the screens and the ability to perceive our eyes was Apple with its Retina technology. During the presentation of the iPhone 4 in 2010, Steve Jobs said that the human eye can perceive up to 300 dots per inch, thereby placing its Retina screens above this threshold. However, this is not true.
Many experts, for example, Raymond Soneira of DisplayMate, argue that the actual resolution of a human retina in perfect condition is 0.6 minutes of arc per pixel. This is a unit of angular measurement roughly relates the spot size and the distance from which we observe it. We can guess what it is if we imagine that the top and bottom of each pixel out two straight lines that directly affect our eyes. The angle between these two lines determines whether or not we can see the object (a visual angle of 1 degree equals 60 minutes of arc).
Leaving aside these gory details, what we need to know is that many experts believe that the resolution of the human eye is very high. In fact, the research on optical J. Blackwell , the Optical Society of America, went even further than Raymond Soneira 1946 to ensure that the resolution of the human eye is actually very close to 0.35 arc minutes.
The human eye is able to discern to 530 pixels per inch
The unit we are handling, arc minutes, is not intuitive for most of us, so we transform it into a figure that we can easily understand. For this reason, it suits us to use research by Roger N. Clark , a photographer, astronomer and scientist trained at MIT (Massachusetts Institute of Technology), which, after making some pretty complex calculations, has concluded that the human eye has the ability to discern up to 530 pixels per inch.
Considering what these scientists defend arrive at the conclusion that, for example, an iPhone 5 would require that the pixels were between 40 and 65% smaller than current so that the eyes of a person with perfect sharpness visual were not able to distinguish them.