How to Test Your Screen for Dead and Stuck Pixels
When unboxing a new gaming monitor or inspecting a second-hand display, performing a dead pixel test is an essential quality assurance step. Computer screens contain millions of subpixels (RGB: Red, Green, Blue). A single dead transistor can freeze a subpixel in an off or permanently illuminated state.
Dead Pixels vs Stuck Subpixels
A dead pixel is a permanently unpowered pixel that appears black on bright or white backgrounds. A stuck pixel occurs when one or two RGB sub-elements remain permanently powered ON, displaying a fixed bright red, green, or blue dot on dark backgrounds.
Backlight Bleed & IPS Glow Check
Selecting the pure black test mode in a dimly lit room helps evaluate backlight uniformity and corner IPS glow on LED-backlit displays.
Frequently Asked Questions
Frequently Asked Questions
A dead pixel is completely unpowered and remains black on light backgrounds. A stuck pixel is stuck in a permanently ON sub-pixel state (displaying red, green, or blue).