Colour CRT has a fluorescent face which consists of three primary colour fluorescent materials of (1) green material fluorescent material, (2) blue fluorescent, and (3) red fluorecent material, each of which is made to have a stimulus purity of 50-70%. Each of (1), (2) and (3) uses a mixt. of fluorescent substance of its colour and fluorescent substances of the other colours. When a colour CRt is used as a display, it is more favourable to limit stimulus purity of three primary colour within the range in terms of character of image recognition and eyes fatigue.
COLOR CRT