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The resolution of smartphone screens has reached the capabilities of human vision

20.12.2013

Flagship smartphones and modern Ultra HD TVs have already surpassed the limits of human vision. The permit race, which is only gaining momentum, no longer makes any sense. Most industry experts agree on this point of view.

"In the new 4K TVs, the average person won't be able to see the difference [versus Full HD]," said Raymond Soneira, head of screen testing firm DisplayMate. In 2010, Steve Jobs introduced the iPhone 4 with a Retina screen. This display was not just very good, it had such a pixel density that the human eye could not distinguish them and, accordingly, a further increase in this parameter became pointless.

In the new Apple smartphones, this figure has been maintained - 326 ppi, but in the new Android flagships like the HTC One and LG G2, the pixel density has already exceeded 400 ppi. As for TVs, the new 4K format is now being actively promoted. It offers 4 times the resolution of "regular" Full HD TVs. At the same time, Full HD at the distance at which viewers usually watch TV can be considered something like Retina - the human eye no longer distinguishes between individual pixels. In other words, you can only see the difference between 4K and Full HD at close range, with normal use the difference will simply not be visible.

"There is a certain density limit beyond which you can't make a better image because of the limitations of your eye," said Don Hood, a professor of ophthalmology at Columbia University. If you stretch your hand in front of you and look at the nail of your index finger, then the average person will not be able to distinguish 120 alternating black and white stripes on the nail. Trying to distinguish between pixels on a 1136x640 smartphone screen or a 1920x1080 TV will be a similar task. This is the physical limit of human vision.

In practice, people would not be able to distinguish between individual pixels, even if they were twice as large. An interesting trend can already be noticed - people who buy expensive 4K TVs put the sofa and armchairs closer to the screen so that the difference with the previous TV is "striking", because at the same distance as before, the difference will not be noticeable.

Thus, increasing the screen resolution is more of a marketing than a really necessary thing for the user. Moreover, as practice shows, for 4K on TVs and 2K on smartphones, people are really ready to overpay, and seriously. Moreover, they are even ready to endure such serious shortcomings as the lack of suitable content and a serious increase in power consumption.

In fact, work on color rendering and video signal processing technologies can really improve image quality. If you continue to increase the resolution, a person will have to improve his eyes so that he can see the difference.

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High sensitivity 20 MP image sensor from Toshiba 08.01.2013

Toshiba has announced the release of the TCM5115CL image sensor for cameras. The CMOS type sensor, which uses back-illumination technology (BSI), is made in 1/2,3-inch format and has a resolution of 20 MP. According to the manufacturer, this is the maximum resolution among sensors of this format.

Increasing the resolution to 20 MP led to a reduction in the size of an individual light-sensitive element to 1,2 microns. The developers note that the quality was not affected, as they managed to increase the total pixel capacity (the charge that it can accumulate before saturation) by 15% compared to the previous generation Toshiba sensor with a resolution of 16 megapixels, which had a pixel size of 1,36, XNUMX µm.
The sensor supports 1080p video at 60 fps and 720p video at 100 fps.

Among the advantages of the sensor, the manufacturer also notes the high sensitivity provided by BSI technology. The development and production of image sensors Toshiba calls one of the priorities of its activities. By 2015, the Japanese manufacturer expects to take 30% of the world market for these products.

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