Why both android mobile phone has a screen black side?

Mobile phone screen size but now more and more big, and applied to the screen technology is more and more advanced, however, believes that many users find the iphone or the latest android mobile phone, the screen between the border and there is always a "dark side", especially in the white fuselage on the phone, this kind of situation more obvious, this for users with obsessive-compulsive disorder, looking at is some unpleasant.So why has this kind of situation?Come to this, we will find out!
Why both android mobile phone has a screen black side?
Here, the first to point out that the reason why is whether the iphone is android mobile phone has a screen black side this kind of phenomenon, is not a design problem, but there must be, its scientific name is called the BM area.It is because what is?Mainly for two reasons:
1, prevent light-leaking
Every mobile phone screen will appear a little error when assembling, absolutely impossible to achieve alignment.If the screen frame with BM area visible edge trimming, on the edge of the frame will be a colorful glare.If the screen assembly when the error is bigger, BM area can't effectively keep out, can cause cell phone screen appears obvious light-leaking phenomenon.As for why use black light-leaking proof?Because black can absorb all colors.
2 and the distance between inside and outside the screen
Generally divided into two layers of the phone's screen, the inside is to display layer, the outer layer is to protect the glass touch.Between a certain distance, the distance will exist.
However, as the technology upgrade, black side have the very good control the phone's screen.

Through the introduction of the above, we can clearly realize the intelligent mobile phone screen black side is always there, in fact as long as it is electronic screens, no matter mobile phone or TV, black side will exist.However, we can be sure of is the development of technology, black side will eventually disappear from the screen!