Definition of screen plate in English:

screen plate

noun

  • 1A metal mesh or grid in the form of a plate, especially one used for sorting or separating material.

  • 2Photography and Printing a screen; especially (in early photography) one which is covered with a pattern of fine lines in three primary colours, used to produce a colour image in a single exposure (now chiefly historical).

Origin

Mid 19th century; earliest use found in Pennsylvania Inquirer & National Gazette.