A color television cathode ray tube screen has to be coated with three different phosphors, one for each of the chosen red, blue, and green primaries. These must be separated physically from one another and each energized by an electron beam of intensity proportional to the appropriate color voltages. The object is to produce three coincident rasters that reproduce the red, blue, and green content of the transmitted picture. Seen from a normal viewing distance the eye records at each part of the picture the hue corresponding to the addition of the light outputs of the three primary colors radiated from that part of the screen.
The phosphors may be arranged in dots as in shadow-mask tubes; in horizontal strips or in vertical strips as in Trinitron tubes. Three separate guns method is used in shadow-mask tubes. A single beam the modulation of which is switched in sequence among the three colors voltages employs this method.
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