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Monitor / Display diagnostics

Test what the browser can see. Know when it cannot.

Use visual patterns and browser timing to inspect pixels, gradients, sharpness, resolution and refresh behavior.

Run these first

Relevant live checks

Dead Pixel TestShow solid colors full-screen so you can visually inspect for dead or stuck pixels.
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Backlight Bleed TestShow a black full-screen pattern for visual backlight bleed inspection.
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Screen Gradient and Banding TestDisplay smooth gradients to inspect visible color banding.
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Monitor Refresh Rate TestEstimate display refresh timing using animation frames.
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Screen Sharpness TestDisplay fine lines and text patterns to inspect scaling and sharpness.
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First diagnostic sequence

Do the high-signal checks before risky changes

  1. 1

    Use fullscreen visual tests

  2. 2

    Confirm native resolution and refresh rate

  3. 3

    Distinguish visual inspection from instrument measurement

What DeviceOK/browser can help check
  • Display inspection patterns
  • Estimate browser refresh timing
  • Report screen/viewport resolution
What this browser page cannot prove
  • Measure color accuracy without a colorimeter
  • Automatically see a dead pixel on the same panel
  • Read panel electronics or backlight voltage