Dead Pixel Test: Online Fullscreen Display Diagnostic

Inspect your screen across 8 full-field color stages (White, Black, Red, Green, Blue, Cyan, Magenta, Yellow) to immediately reveal dead subpixels, stuck liquid crystal gates, and dust under glass.

Pure White(#FFFFFF)
Tap for Fullscreen · Tap swatch to cycle

What to Look For During This Test

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Dead Pixel (Black Dot on Color/White)

A dead pixel receives no electrical voltage, leaving all three RGB subpixels permanently off. It shows as a persistent black dot across white and colored screens.

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Stuck Subpixel (Red, Green, or Blue Dot on Black)

A stuck subpixel has one transistor frozen in the open position. It shines as a bright colored pinpoint (red, green, or blue) against pure black backgrounds.

Surface Dust or Lint Spot

Surface dust casts a faint shadow that shifts with your viewing angle, whereas a pixel flaw stays fixed strictly inside the panel grid layer.

Backlight Bleed Halo

A cloudy light leak along monitor edges visible on dark screens caused by mechanical bezel clamping pressure rather than broken pixels.

In-Depth Engineering Reference

Want the full diagnosis and warranty recovery guide?

Understand manufacturer pixel fault tolerances (ISO 13406-2), how to tell surface dust from broken pixels, and retailer return timelines.

Testing Questions & Answers

Wipe your screen with a dry microfiber cloth first. Click the test canvas to enter fullscreen, cycle through Black, White, Red, Green, and Blue screens, and scan your eyes slowly across each quadrant from 12-18 inches away.