Basic TV Technology, 4th Edition

CRTs convert color signals to video images

Color CRTs

Just as the color camera works in a manner similar to the black and white camera, the color CRT works in a manner similar to the black and white CRT. The color CRT has three sets of color phosphor dots laid down on the inside of the CRT. These are laid down in a specific pattern. The exact pattern will differ from manufacturer to manufacturer, but for the sake of explanation, a very common pattern, the triad, will be used. As you can see from the first figure on the right, the triad is made up of one red phosphor dot, one green phosphor dot, and one blue phosphor dot arranged in a triangular pattern.

At the back of the CRT there are three separate electron guns, one each for the red, green, ...