shadow mask

noun Television.

a perforated metal plate situated behind the faceplate of a color television picture tube and having holes aligned to insure that each of three electron beams strikes only its corresponding red, green, or blue phosphor dot.
Also called aperture mask.

Origin of shadow mask

First recorded in 1950–55

Words nearby shadow mask

shadow bands, shadow box, shadow cabinet, shadow dance, shadow history, shadow mask, shadow of one's self, shadow pin, shadow play, shadow price, shadow roll

Example sentences from the Web for aperture mask

  • From the eyeless sockets of the shadow-mask a phosphorescent gleam shot towards the Grand Chamberlain.

    Under the Witches' Moon |Nathan Gallizier

British Dictionary definitions for aperture mask

shadow mask

noun

television a perforated metal sheet mounted close to the phosphor-dotted screen in some colour television tubes. The holes are positioned so that each of the three electron beams strikes the correct phosphor dot producing the required colour mixture in the image