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aperture grille
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Diagram of a color television picture tube using the shadow-mask technique, showing red, green, and blue electron beams from electron guns passing through an aperture grille to strike phosphor-coated glass, with labeled parts and a close-up of the grille structure.
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aperture grille

electronics
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Diagram of a color television picture tube using the shadow-mask technique, showing red, green, and blue electron beams from electron guns passing through an aperture grille to strike phosphor-coated glass, with labeled parts and a close-up of the grille structure.
colour television picture tube At right are the electron guns, which generate beams corresponding to the values of red, green, and blue light in the televised image. At left is the aperture grille, through which the beams are focused on the phosphor coating of the screen, forming tiny spots of red, green, and blue that appear to the eye as a single colour. The beam is directed line by line across and down the screen by deflection coils at the neck of the picture tube.

An aperture grille is a component used in color cathode-ray tube (CRT) televisions. It is a metal grille with vertical slots that replaced the traditional shadow mask. This innovation, introduced by Sony, allowed electron beams to pass through the slots to strike the colored phosphors on the screen, which are arranged in vertical stripes. The aperture grille directs more electrons to the phosphors, resulting in a brighter image compared to shadow-mask tubes. CRTs, the technology employing aperture grilles, produce images by directing electron beams onto a phosphorescent screen.12

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3 Britannica Sources
  1. cathode-ray tube
  2. shadow mask
  3. television - Shadow masks and aperture grilles

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