by 
The Curious Bag
-
A cathode ray tube serves as the principle component in old televisions, and is used to create the images on the screen. Despite the apparent complexities, the tube is actually fairly simple in concept.
Basics
A cathode ray tube is essentially a large, boxy piece of glass, with the cathode ray at one end and a screen coated with phosphors at the other.
The Cathode
The cathode itself is a negatively charged electrode inside the screen. When it receives power, it fires a beam of electrons into the tube.
The Anode
As the cathode fires, the electrons move through positively charged electrodes, which accelerates them and focuses them into a tight beam.
The Beam
The beam itself them moves back and forth across the far side of the tube: a screen covered with a sheet of phosphors. The phosphors glow where the beam strikes them.
The Image
The electron beam moves so quickly across the screen that it can shift the individual pixels on the phosphor sheet faster than the eye can detect, creating different levels of light. The image onscreen thus appears to move.
Source:
RELATED QUESTIONS
Copyright 2023, Wired Ivy, LLC