Gray Screen - Fullscreen Gray Uniformity Test
Open fullscreen gray screens to check dirty screen effect, OLED retention, tint, clouding and brightness uniformity.
Quick answer
Fullscreen gray screens are useful for checking dirty screen effect, OLED retention, cloudy patches, tint and brightness uniformity.
Method: ScreenTestKit generates the test surface in your browser. Results depend on visual inspection; the site does not read or diagnose physical panel hardware.
How to use this test
- Start with mid-gray at normal brightness.
- Check darker and lighter gray levels if available.
- Look for vertical bands, cloudy patches or fixed UI shapes.
- Compare with white, black, OLED and uniformity tests.
What to watch for
- Dirty screen effect or vertical banding.
- Faint shapes from previous OLED content.
- Cloudy patches or pressure marks.
- Yellow, pink or green tint on gray backgrounds.
How to interpret results
Banding on gray
If bands are visible in normal content, document them and run the uniformity test.
Faint UI shape
On OLED, compare after rest or varied content to separate retention from burn-in.
Only at extreme angle
Viewing angle can exaggerate gray uniformity issues.
Frequently asked questions
Why use gray instead of white?
Mid-gray reveals dirty screen effect and subtle tint more clearly than pure white.
Which gray level should I use?
Start around 50 percent gray, then compare darker gray levels for OLED retention.