What defects show on a blue screen?
Dead pixels appear dark; stuck pixels may show wrong colors as bright dots against blue.
A pure blue fullscreen activates only blue subpixels — ideal for channel tests and cool-toned ambient lighting.
Défile blanc, noir, rouge, vert et bleu toutes les 5 s. Idéal en plein écran. Tous les tests d'affichage →
Préréglage de résolution
Reveal subpixel defects and uniformity issues specific to the blue channel.
Blue light can reduce harsh shadows in low-light creative setups.
Use alongside white and grey screens to evaluate color temperature drift.
Blue subpixels often show age-related issues first on some LCD panels — a full blue field makes weak zones visible.
Combine with red and green tests to map which channel causes tint shifts on your display.
Ouvrir le fond white en plein écran
Ouvrir le fond black en plein écran
Ouvrir le fond red en plein écran
Ouvrir le fond green en plein écran
Ouvrir le fond yellow en plein écran
Ouvrir le fond orange en plein écran
Ouvrir le fond pink en plein écran
Ouvrir le fond purple en plein écran
Ouvrir le fond grey en plein écran
Dead pixels appear dark; stuck pixels may show wrong colors as bright dots against blue.
Reduce brightness for long sessions. This tool does not increase emission beyond your panel settings.
Yes — select 4K (3840×2160) and download PNG.
Yes, in browsers that support fullscreen and canvas download.