Purple Screen
Purple sits between red and blue, which makes it a useful second-pass test: a full purple screen lights the red and blue subpixels and leaves green off. Any pixel that stays dark here but lights up on white has a red or blue fault.
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What this colour is good for
- Testing red and blue subpixels at once — green faults stay invisible, which isolates them.
- A muted ambient background for streaming, gaming, or a dim room.
- Colour reference for design work that needs a mid-saturation purple.
#800080 is a deep, low-luminance purple. Don't judge brightness or contrast uniformity from it; use white or grey for that.
Frequently asked questions
Why use purple for pixel testing?
Every primary-colour screen lights one subpixel. Purple lights two, so it lets you narrow a fault down: bright on purple but dark on white means green is dead, and the reverse means red or blue.
Is purple light bad at night?
Purple contains blue wavelengths, which affect sleep more than red or yellow. As ambient light it is attractive but not the best choice before bed.