plural blue screens
Definition of blue screen
1
: a photographic technique in which a subject is filmed in front of a blue background so as to allow matte (see matte entry 3 sense 2) compositing of the film with other footage
also
: the blue background — compare green screen
2
: blue screen of death
Many blue screens are caused by bad memory modules or corrupted disk drives.— George Cox
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Merriam-Webster unabridged
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Time Traveler for blue screen
The first known use of blue screen was in 1965
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