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What people use it for
Extra light for calls
A bright white or warm-white screen works as fill light for video calls when you don't have a proper lamp nearby.
Dead pixel check
Solid colours make stuck or dead pixels easy to spot — cycle through white, black, red, green and blue to check a monitor before buying or returning it.
Screen cleaning
A plain bright background shows smudges and dust that are invisible against normal content.
Reading light
A warm, dim screen glow is gentle enough to read by without getting up to switch on a lamp.
Tracing & light tables
Lay paper over a bright screen to trace drawings, the same way you'd use a light box.
Chroma key backdrop
Pure green or blue at full brightness gives a rough green-screen effect for quick webcam effects.