Screen Uniformity Test

Use white and gray fields to inspect brightness, tint and panel consistency across the center, edges and corners.

Why this test is useful

Compare the center, edges and corners for broad brightness changes, warm or cool tint, dirty screen effect and large patches rather than isolated pixels. Repeat uniformity checks at several gray levels because a variation can be obvious at mid gray and almost disappear on pure white or black.

Before you start

• Clean the screen first so dust, fingerprints and dried cleaner are not mistaken for a panel defect.
• If automatic brightness or dynamic contrast keeps changing the image, turn it off for the comparison and restore it afterward.
• Start at the brightness you normally use. Extreme brightness can exaggerate some panel behavior and make the result less representative of daily use.

A reliable way to run the test

1. Inspect the whole panel in an ordered path from one corner to the other rather than staring only at the center.
2. Repeat uniformity checks at several gray levels because a variation can be obvious at mid gray and almost disappear on pure white or black.
3. Compare the center, edges and corners for broad brightness changes, warm or cool tint, dirty screen effect and large patches rather than isolated pixels.
4. When you notice a suspicious point or region, remember its exact position and repeat the same location with another pattern.

How to read the result

Compare the center, edges and corners for broad brightness changes, warm or cool tint, dirty screen effect and large patches rather than isolated pixels. Repeat uniformity checks at several gray levels because a variation can be obvious at mid gray and almost disappear on pure white or black. After an artificial pattern reveals something, check the same area with real photos, video or games at your normal viewing distance.

What to do next

• Repeat uniformity checks at several gray levels because a variation can be obvious at mid gray and almost disappear on pure white or black.
• After an artificial pattern reveals something, check the same area with real photos, video or games at your normal viewing distance.
• A browser test does not decide whether a panel is inside a manufacturer tolerance. Use the maker pixel policy or warranty terms for that decision.

What this test cannot prove