Definition: Cathode Ray Tube: the basic technology of computer monitors, just like domestic TV. * A source of electrons -- the cathode -- produces a stream or ray of electrons which are accelerated towards a screen covered in phosphors that glow when hit by electrons, the whole process taking place in a vacuum in an evacuated glass container -- the tube. * To obtain colour, red, green and blue coloured phosphors are used, with the beam directed at the correct dot of phosphor by a screen with precisely punched apertures or precisely located wires.

Related Terms: aperture grille, shadow mask, Trinitron

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