Display Diagnostic
Dead Pixel Test
Cycle through pure solid colors in full-screen mode to easily spot hardware defects, stuck sub-pixels, or dead pixels on your display.
Ready to test your screen?
Make sure your screen is clean before starting. Dust particles can often be mistaken for dead pixels.
Gently wipe your monitor with a microfiber cloth. Dust and smudges mimic pixel defects.
Click the start button to enter full-screen mode, removing all browser UI distractions.
Use mouse clicks, touch, or arrow keys to cycle through primary and advanced colors.
Understanding Display Defects
When purchasing a new monitor, laptop, or smartphone, checking the display quality is a critical first step. Modern LCD and OLED panels contain millions of individual pixels, each made up of red, green, and blue (RGB) sub-pixels. Due to manufacturing complexities, a tiny percentage of these panels ship with microscopic anomalies known as dead or stuck pixels.
Our browser-based diagnostic tool is engineered to help you identify these defects instantly. By isolating the screen into pure, bright primary colors, human vision can easily detect sub-pixel failures that might otherwise go unnoticed during regular use or video playback.
Dead Pixel vs. Stuck Pixel
Dead Pixels: A dead pixel occurs when the transistor powering it completely fails to supply power. This results in a permanently black dot on your screen. They are most visible against a pure white or bright background. Unfortunately, true dead pixels are permanent hardware defects and cannot be fixed with software.
Stuck Pixels: A stuck pixel happens when one or more of the sub-pixels (red, green, or blue) remain permanently "on". This creates a stubborn, bright dot of a specific color that refuses to change. Stuck pixels are most obvious on a pure black background. Unlike dead pixels, stuck pixels can sometimes be revived using rapid color-cycling software (like our Burn-in Fixer tool) or gentle physical pressure.
Frequently Asked Questions
Does this tool fix dead pixels?
No. This specific tool is strictly for diagnosing and locating defects by flooding the screen with pure colors. If you discover a stuck pixel, you can try our Burn-in Fixer tool to attempt to stimulate the pixel back to normal operation.
Can a dead pixel spread to other pixels?
Generally, no. A dead pixel is an isolated transistor failure and is not "contagious." However, if the screen suffered physical damage or internal pressure, you might see more pixels failing in the surrounding area over time.
Will this work on OLED and QLED screens?
Yes. The logic of sub-pixels applies to all modern screen technologies, including IPS, TN, OLED, AMOLED, and QLED displays. The pure colors generated by our tool will properly isolate the RGB diodes on any panel type.