Generating Images
The familiar heavy and box-shaped TVs are capable of producing a high-quality picture. The name CRT (cathode ray tube) comes from two important image-generating components: the cathode, a heated filament; and the ray, a stream of electrons shot against the inside of the picture tube.
Creating Pictures
The inside of the display is coated with phosphors, which are excited by the electronic beam. Guided by a magnetic field created by coils within the CRT, the electronic beam paints images on the screen by moving across the phosphors one line at a time.
Creating Color
Color CRTs have one electron beam and red, green and blue phosphors, which are arranged on the inside of the picture tube in dots or strips. The interaction of the gun with the phosphors produces that old, reliable color picture.
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