Aluminized screen

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Aluminized screen is a cathode-ray tube screen whose brightness is increased by coating the phosphor with a thin layer of aluminium. Light from an excited part of the phosphor that would normally shine back inside the tube is thus reflected forward, increasing the total light output from the screen. The aluminium layer must be thick enough to reflect efficiently, but not so thick as to absorb too great a proportion of the electrons that strike it.