types of display devices
CRT display is the most commonly used form of visual displays, through it is getting gradually replaced with LCD and Plasma displays. A computer monitor using CRT display. In a CRT, an electron beam sweeps the display screen horizontally, one line at a time, gradually down the screen. A synchronization (sync) signal brings the beam back to the top row of the display. This type of scanning (line-by-line) is known as raster scan.