cathode ray tube
vacuum tube that can show moving pictures, vector graphics, or lines
AI overview
A cathode ray tube is a vacuum tube that uses a beam of electrons to display moving pictures, graphics, or lines on a screen. This technology was fundamental to televisions and computer monitors for decades, making it essential to how most people watched TV and used computers throughout the 20th century.
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Cathode ray tube cross section diagram (not to scale) with its focused and deflected electron beam (in green) Oscilloscope cathode ray tube Cutaway rendering of a color CRT:Electron guns (cathodes) for red, green, and blue Electron beams Focusing coils Deflection coils Anode connection Shadow mask for separating beams for red, green, and blue parts of the displayed image Phosphor layer Close-up of the phosphor layer showing red, green, and blue zones
Cutaway rendering of a monochrome CRT:Deflection coils Electron beam Focusing coil Phosphor layer Filament for heating the cathode Graphite layer on the inner side of the tube Anode connection Electron gun (cathode) Air-tight glass body of the tube Screen Deflection yoke Control electrode modulating the intensity of the electron beam Contact pins for cathode, filament and control electrode Wire for anode high voltage