Consumer Electronics

DIFFERENCE BETWEEN A MONOCHROME AND A COLOUR PICTURE TUBE

The colour picture tube differs from the monochrome picture tube in the following four aspects:

1. It has three guns which provide three electron beams, one each for the three primary colours (trigun, tricolour).
2. The screen of the colour picture tube is coated with three different types of phosphor droplets which separately emit red, green and blue light when the phosphors are bombarded by the high velocity electrons from the three guns.
3. The phosphors are embedded on the screen in a triangular dot pattern (triad). Each triad has a group of three phosphor dots.
4. The shadow mask which is accurately mounted on the face about ½ inch behind the screen is the fourth distinguishing feature between ...