ABSTRACT
On a television screen, for a single dot to appear as white it will have to be made up from three smaller dots. The dots, in the case of a cathode ray tube, are phosphors and phosphor will glow when hit by a beam of electrons and it will glow with a different brightness depending on the strength of the beam. The three small dots of phosphor that make up a larger dot that can appear to glow white have phosphors capable of glowing red, green or blue. A nearly infinite number of colors can be obtained from varying the brightness of each of the colored dots. If all three dots are glowing at 100 percent brightness then this will appear as pure white and if they are all switched off this will represent as near to black as the screen can produce.
