There are three different '''addressing schemes''' for [[display device]]s: ''direct'', ''matrix'', and ''raster''. The purpose of each scheme is to set (or maintain) the state of a [[pixel]] to either black/white or, more commonly, a [[grayscale]] level.
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==Raster addressing==
A '''raster addressed''' display (e.g., a [[Cathode-ray tube|CRT]]) works by scanning across the entire display in sequence while modulating control signal to activate each pixel as it is scanned. This display uses persistence of the pixel element (e.g., [[phosphor]]) to maintain the pixel state until the scan can visit that pixel again. There are only three control signals required for this to work: a horizontal scan control signal, a vertical scan control signal, and an intensity control signal. Timing between these signals is very important, else the image on the screen will show artifacts.
