Monitor & Display Test Patterns

These patterns each isolate one panel behaviour. Run them in a dim room, at 100% browser zoom, with any "night light" or colour filter turned off — otherwise you are testing your software, not your screen.

All Screen Tests

8 tools
Gradient Smoothness Test Test your monitor for color banding and gradient smoothness issues. Detect 6-… OLED Burn-in Test Detect and prevent OLED burn-in with this free tool. Moving pattern reveals g… Checkerboard Pattern Test Test pixel-level sharpness with a full-screen checkerboard pattern. Detect bl… Pixel Response Time Test Test pixel response time with rapid black-white transitions. Detect ghosting… Viewing Angle Test Test viewing angle performance with color bands. Check for color shifting and… Gray Uniformity Test Test for backlight bleed, clouding, and brightness uniformity with 50% gray s… Color Accuracy Checker Check monitor color accuracy with reference swatches including primaries, gra… Auto Color Cycle Fix stuck pixels by rapidly cycling colors. Stimulates pixel transistors. Run…

Running the patterns in a sensible order

  1. Start with the checkerboard — it finds hard pixel faults fastest.
  2. Then gray uniformity for backlight problems across the whole panel.
  3. Then gradient for bit-depth and banding.
  4. Then pixel response for motion behaviour.
  5. Finish with viewing angle and colour accuracy, which are judgement calls rather than pass/fail.

Reading the results honestly

Most panels fail something. A little corner glow on IPS, faint banding on an 8-bit panel, and slight tint shift off-axis are normal manufacturing variance, not defects. What warrants a return is a fault you can see during ordinary use from a normal viewing distance — most manufacturer warranties state a dead-pixel count threshold, so check yours before you file a claim.

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