Before the discovery of LCD and LED displays, there was a display technology called CRT or Cathode Ray Tube. But one big disadvantage of the display was that some portion of the display will retain the content it used to display regularly. But why this was happening? When a same image is being displayed regularly on the same spot, the ray hitting from the CRT will use up the phosphorous on that part of the screen. To prevent this problem, we found a simple method and that was by using screen savers. They are randomly displayed image, text or animation which changes continuously so that no part of screen displays same content all the time. But, in the world of innovations and modern display technologies, is this still a concern? Let's find out. There is a concern about AMOLED screens particularly having a burn effect. But why does that happen in this modern technology which uses entirely different display methods than CRTs. In smartphone displays with 'always on...