Use-case page
Use a fullscreen black screen pixel test to check dead pixels, stuck pixels, and uneven glow. Then cycle through colors for a more complete display test screen.
Run the test
A black screen dead pixel test helps you catch bright stuck pixels, backlight bleed, and dark-scene panel issues. Follow with white, red, green, blue, and purple for a fuller stuck pixel test and resolution-specific inspection on the HD, 1080p, or 4K pages.
Start with black to reveal bright defects, then move through the other colors to uncover subpixel problems and uniformity issues.
A screen test black background is especially good for bright stuck pixels, IPS glow, local dimming bloom, and backlight bleed that is hard to see on normal webpages.
After the black screen pass, compare the panel on the 1080p or 4K pages if you are testing a specific resolution, or open the cleaning page if dust might be masking a pixel issue.
Pixel testing
This page is designed around the main dead-pixel workflow, with direct links into cleaning and resolution-specific checks.
Black helps identify pixels that stay bright when they should be off.
Red, green, and blue screens help reveal subpixels that remain frozen.
Dark backgrounds make clouding, glow, and bleed easier to notice.
No downloads, no test images, and no distracting browser chrome.
FAQ
Yes. A black screen dead pixel test is great for spotting pixels that stay bright when the rest of the panel is dark.
Use the color cycle or switch through red, green, blue, and white to reveal stuck subpixels that do not change correctly.
Fullscreen helps because it removes borders, tabs, and other bright UI that can distract from tiny pixel defects.