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Monochrome TV did not have pixels...Some had scan lines or grain from coarse ground phosphor (both should be constrained to lower end or poorly adjusted sets), but there were no pixels...A monochrome CRT needs only one color of phosphor to work so the entire face can be evenly coated with it. A color CRT needs three phosphor colors (red green and blue) that evenly cover the face but each be kept separate from the other colors and individually addressable by the electron gun(s) and thus the three need to be laid down in separate discrete dots in an even pixel-like mosaic.
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