Image Formation: By controlling the electron beam’s position and intensity, the CRT creates an image on the phosphor screen composed of multiple lines, each containing a series of illuminated pixels.The intensity of the electron beam determines the brightness of each pixel. Phosphor Screen Activation: When the accelerated electrons collide with the phosphor screen, the phosphor material emits visible light.In a TV, this process occurs line by line, from top to bottom, creating a raster scan pattern. Deflecting the Electron Beam: The deflection system uses magnetic or electrostatic fields to guide the electron beam horizontally and vertically across the phosphor screen.These electrons are then accelerated and focused into a narrow beam. Generating Electrons: Inside the electron gun, a heated cathode releases electrons through a process called thermionic emission.Glass Envelope: A vacuum-sealed glass tube houses all the aforementioned components.Deflection System: Comprised of magnetic or electrostatic fields, this system controls the movement of the electron beam across the screen.Phosphor Screen: The front surface of the CRT, coated with phosphorescent material, emits visible light when struck by accelerated electrons.Electron Gun: Located at the rear of the CRT, the electron gun generates and accelerates electrons.This article will provide an overview of how cathode ray tubes work. Although they have been largely replaced by newer display technologies, CRTs remain a fascinating subject due to their unique working principle. Understanding Cathode Ray TubesĬathode ray tubes (CRTs) were the primary technology for displaying images on television screens and computer monitors for several decades. ![]() A cathode ray tube works by generating an electron beam, deflecting it across a phosphor screen, which then emits visible light to form images.
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