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Cathode ray tubes

Vacuum tube used to display imagesCathode ray tube cross section diagram (not to scale) with its focused and deflected electron beam (in green)Oscilloscope cathode ray tubeCutaway rendering of a color CRT:Electron guns (cathodes) for red, green, and blueElectron beamsFocusing coilsDeflection coilsAnode connectionShadow mask for separating beams for red, green, and blue parts of the displayed imagePhosphor layerClose-up of the phosphor layer showing red, green, and blue zonesCutaway rendering of a monochrome CRT:Deflection coilsElectron beamFocusing coilPhosphor layerFilament for heating the cathodeGraphite layer on the inner side of the tubeAnode connectionElectron gun (cathode)Air-tight glass body of the tubeScreenDeflection yokeControl electrode modulating the intensity of the electron beamContact pins for cathode, filament and control electrodeWire for anode high voltageThe only visible differences are the single electron gun, the uniform white phosphor coating, and the lack of a shadow mask.A Macintosh computer from the 1990s with integrated CRT displayA cathode ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams, which are directed and controlled to display images on a phosphorescent screen.

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