Fill the screen with a solid color to find dead or stuck pixels on your monitor.
A dead pixel is a pixel that stays black regardless of the image. A stuck pixel stays one color — usually red, green or blue. Both are manufacturing defects in LCD and OLED panels, and most manufacturers have a dead pixel policy that allows an exchange if the count exceeds a threshold.
This test fills the entire screen with a solid color so any defective pixel stands out against the uniform background. Red, green and blue test the individual subpixels; white and black test all three at once.
Run this test on a new monitor before the return window closes, and in a dimly lit room where defects are easier to spot.
Sometimes. Gentle pressure or rapid color cycling may unstick it. Dead pixels (no light at all) cannot be fixed.
It depends on the manufacturer and panel class. ISO 9241-307 defines classes; most consumer monitors allow 0-5 defects.
Yes — click a color and look at the full-screen display.
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