Blue screen
Fill your entire screen with pure blue — to expose stuck or dead blue subpixels, check TV picture settings, or cast some mood light. Click or press Esc to exit.
More color screens
Blue screen FAQ
- What is a full blue screen used for?
- It lights only the blue subpixel of every pixel, so a dot that stays dark or shifts color on this field means a faulty blue subpixel. Blue fields are also the classic backdrop for checking TV picture settings — some calibration discs use blue-only modes for color and tint — and, more casually, as mood or party lighting.
- Is this the Windows blue screen of death?
- No — this page just fills your display with pure blue on purpose, and clicking or pressing Esc exits immediately. The Windows BSOD is an error screen with white diagnostic text and a stop code that appears when the operating system crashes. If you're seeing that, the fix lies in drivers, hardware, or Windows itself, not your display panel.
- Why does blue look dimmer than red or green?
- Human eyes are simply less sensitive to blue light, so a full blue field always looks darker than full red or green at identical panel output — it's biology, not a defect. Uneven brightness across the blue field, though, is worth noting: run the uniformity test to see whether the panel shows the same patches on gray.