Screen Uniformity Test with Six Gray Levels
Compare six uninterrupted gray levels for visible patches, tint or uneven areas.
Free to use. Runs in your browser. No signup.#0d0d0d · RGB 13, 13, 13This is a smaller preview. Open the screen to fill your display and hide the page controls.
Compare full-screen gray levels
Compare six neutral gray levels across the entire screen. Look from your usual viewing position; no dividing lines are added to the pattern.
Press Escape to exit. Move the pointer or tap the screen to bring back the Exit button.
Observe brightness variation and tint on uniform gray fields
Inspect the whole display at six encoded gray levels: 5%, 10%, 20%, 50%, 80% and 100%. Each field has the same RGB value across its area and hides page controls during fullscreen observation. The percentages describe digital channel values, not measured panel brightness. Compare the same physical regions at several levels while keeping the viewing angle stable. This is a visual aid, not a luminance measurement, burn-in repair or automatic pass/fail test.
Ways to use the uniformity test
Compare near-black patches with a mid-gray field.
Observe tint differences across a uniform white display.
Repeat observations at the same angle and device settings.
How to compare gray-field uniformity
A uniform field is useful only when the viewing position and relevant display settings stay consistent.
Start with an uninterrupted mid-gray field
Select 50% gray and enter fullscreen. Hide the controls and look across the entire display. Avoid comparing a bright toolbar with a darker test area or interpreting a reflection as a panel measurement.
Compare near-black and white separately
Step through 5%, 10% and 20%, then compare 80% and white. Keep each encoded level uniform across the display. The same patch may appear differently at another tone, so record the level alongside your observation.
Repeat with the same environment
Keep head position, room light and hardware brightness stable during comparisons. Gray-field observations can reveal a symptom, but cannot determine a fault, its cause or a manufacturer warranty decision.
Continue with a focused check or a guided sequence: Monitor Test
Uniformity Test: questions & answers
Everything you need before your next download.
Is 5% gray five percent of measured brightness?
No. It is an encoded RGB channel level, rounded to an 8-bit gray value. Actual light output depends on the display response, brightness and processing.
Can the page diagnose OLED burn-in?
No. Gray fields may help you observe persistent shapes or uneven areas, but the tool cannot identify the cause, measure severity or repair the panel.