A Cathode Ray Tube (CRT) is an electronic display device that was widely used in older televisions, computer monitors, and oscilloscopes. It works by firing a stream of electrons onto a phosphorescent screen to create images.
Electron Emission: The electron gun at the back of the CRT emits electrons, which are accelerated and focused into a narrow beam.
Beam Deflection: The deflection system moves the electron beam in both horizontal and vertical directions, scanning the screen in a series of lines from top to bottom.
Phosphor Activation: When the electron beam strikes the phosphor coating on the screen, it excites the phosphors, causing them to glow and produce light.
Image Formation: By controlling the intensity of the electron beam and the timing of its strikes, the CRT forms images through combinations of red, green, and blue light.
Television Screens: CRTs were the standard display technology for TVs until the early 2000s.
Computer Monitors: Prior to the advent of flat-panel displays, CRTs were widely used for computer monitors.
Oscilloscopes: Used in electronic testing to display waveforms in real-time.
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