big screen vs silver screen

big screen

noun
  • movies, or that which is related to movies or cinema. 

  • The large viewing surface upon which films are projected in a cinema. 

silver screen

noun
  • By extension, movies, or that which is related to movies or cinema. 

  • A cinema screen onto which movies are projected. 

How often have the words big screen and silver screen occurred in a corpus of books? (source: Google Ngram Viewer )