Three colors-red, blue, and green-are used in television to produce all colors. These separate scanning beams (one for each color) must strike their targeted phosphors (screen's internal coating) with precise accuracy. If the beams are out of alignment, then the image and colors appear muddied.
CONVERGENCE
Meaning of CONVERGENCE in English
Film and video English vocabulary. Английский словарь фильмов и видео. 2012