Output
Steady colors, steps or fine-line patterns
UserBenchmark / All Tools / Screen Uniformity Test
Display
Screen Uniformity Test
Inspect gray fields for uneven brightness, color tint and dirty screen effect.
Free to useNo downloadNo sign-up
Screen Uniformity Test · At a glance
Quick answer: Inspect gray fields for uneven brightness, color tint and dirty screen effect. Large darker patches can show dirty-screen effect.
Screen Uniformity Test
The test loads when you open it. Device access is requested only after you choose to start.
Detailed guide
How to use this tool
- Inspect gray fields from a centered position.
- Compare the center, corners and broad areas for uneven tint or brightness.
Input
Manual visual inspection
Browser requirement
Native resolution; fullscreen support
Processing
Runs on your device; no tool-result upload
How it works and what the result means
These are visual inspection patterns. The page cannot read individual panel pixels, measure nits or contrast ratio, diagnose a panel automatically, or repair dead pixels.
Reading the result
Large darker patches can show dirty-screen effect. The page does not assign a percentage because it cannot measure panel luminance.
Worked example and assumptions
Mid-gray full-screen field
Look for darker zones, color patches or dirty-screen effect. Compare several gray levels and use a normal viewing position.
Look for darker zones, color patches or dirty-screen effect. Compare several gray levels and use a normal viewing position.
What to check next
Disable adaptive brightness and view several gray levels. Camera lens shading can create false unevenness in photos.
Use native screen resolution and 100% browser zoom for fine patterns. Disable adaptive brightness for comparisons. PWM inspection needs an external camera; banding can also be a camera artifact.
Frequently asked questions
Is a dark corner always a defective panel?
Not necessarily. Viewing angle, ambient reflections and camera exposure can contribute. Repeat under consistent conditions and assess normal use.
How do I start the Screen Uniformity Test?
Choose a pattern and open fullscreen. Inspect the entire panel, then click to cycle patterns. Press Escape to leave fullscreen.
Does this tool require a download or an account?
No. Open the interactive tool above in a modern browser. The instructions and explanations are available even with JavaScript disabled; running a test needs JavaScript.
Why can two attempts give different results?
Power settings, background tasks, browser scheduling, operating-system input processing and device settings affect measurements. Compare repeated attempts with identical settings rather than the single highest score.