Screen Uniformity Test
Uniformity patterns help you see whether brightness and color remain consistent from center to corners.
Live screen test
Start with the real patterns.
Reveal dirty screen effect and panel uniformity issues.
What it checks
Use this test when you need a clear visual answer.
Screen Uniformity Test is built for quick inspection, not lab measurement. It gives you controlled browser patterns so you can decide whether the screen needs setup, retesting, or warranty attention.
Dirty screen effect
Color tint shifts
Corner brightness falloff
Result guide
How to read the uniformity result
Start with the 50% gray pattern, then switch to adjacent patterns before making a decision. A real display problem usually stays in the same area when the pattern changes. A reflection, viewing angle shift, browser zoom issue, or temporary image setting often changes when you move your head, adjust brightness, or repeat the test after a restart.
Dirty screen effect
Use this page to isolate dirty screen effect under controlled screen patterns. Scan the center, edges, and corners, then confirm the same area with a second pattern before you treat it as a panel issue.
Color tint shifts
Use this page to isolate color tint shifts under controlled screen patterns. Scan the center, edges, and corners, then confirm the same area with a second pattern before you treat it as a panel issue.
Corner brightness falloff
Use this page to isolate corner brightness falloff under controlled screen patterns. Scan the center, edges, and corners, then confirm the same area with a second pattern before you treat it as a panel issue.
Workflow
How to use the screen uniformity test
Use a neutral gray screen first because unevenness is easier to see than on pure white.
Look across the panel without moving your head too much.
Repeat with white, red, green, and blue to separate brightness issues from color tint.
Use cases
Where this screen test is most useful
Photo editing
Check whether a neutral canvas looks even before trusting color edits.
Sports and panning shots
Find dirty screen effect that appears during camera movement.
Large TV inspection
Large panels are more likely to show clouding or vertical bands.
Reading the result
Practical tips before you decide
Gray is the key pattern
Mid-gray makes banding and tint differences easier to see than high-contrast screens.
Use normal viewing distance
A tiny uniformity flaw may not matter if it disappears at normal distance.
Compare modes
Some picture modes change local dimming or processing and alter uniformity.
Device setup
Use the same screen test across real viewing setups
The screen uniformity test works best when the test matches the way you actually use the display. Keep the room lighting, brightness, scaling, and viewing distance close to normal, then repeat the pattern only after a setting change. This keeps the result practical instead of turning the page into a lab claim.
Desktop and laptop monitors
Use native resolution, 100 percent browser zoom, and the monitor picture mode you normally use. If you change brightness, contrast, overdrive, or color temperature, repeat the uniformity pass before comparing results.
TVs, projectors, and large panels
Step back to your real viewing distance after a close inspection. Large screens can exaggerate small edge, glow, focus, or processing issues, so confirm anything suspicious with normal video, games, or desktop content.
Phones and tablets
Rotate the device if the browser supports it, clean the glass, and reduce reflections before judging the result. Some mobile browsers limit fullscreen behavior, but the same pattern sequence still helps with quick display checks.
Related tests
Continue with adjacent checks
Backlight Bleed Test
A dark room and a full black screen make edge leakage, cloudy corners, and panel glow easier to judge.
White Screen
A fullscreen white screen makes dark pixels, dust, smudges, and brightness falloff easier to see.
Brightness Test
The brightness test helps you set a comfortable level while keeping near-black and near-white detail visible.
Color Banding Test
Smooth gradients reveal banding, posterization, and compression-like steps that flat color screens can hide.
FAQ
Screen Uniformity Test questions
These answers match the visible test on this page and avoid warranty or measurement claims that depend on your specific display.
What is screen uniformity?
Screen uniformity describes how evenly a display shows brightness and color across the full panel.
What is dirty screen effect?
Dirty screen effect is a patchy or cloudy look on flat colors, often visible during sports, sky shots, or panning scenes.
Which pattern is best for uniformity?
A 30 to 50 percent gray screen is usually the most useful starting point.
Can calibration fix poor uniformity?
Calibration can improve overall color and tone, but physical panel unevenness usually remains.
Can I use the screen uniformity test on more than one device?
Yes. Open the same page on each monitor, laptop, phone, tablet, TV, or projector, then compare the uniformity result under similar brightness and room lighting. Device browsers can handle fullscreen differently, but the visual patterns are still useful for a practical check.
Does this online uniformity test replace professional calibration?
No. This page is a browser-based visual test for finding obvious display problems and setup issues. For color-critical work, brightness targets, or measured calibration, use a hardware colorimeter or professional display workflow after the visual pass.
How to Check a Monitor for Dead Pixels
A reliable dead pixel check uses fullscreen solid colors, steady lighting, and a repeatable inspection path. The goal is to separate real panel defects from dust, reflections, scaling artifacts, and temporary cable issues.
How to Test a New Monitor
A new monitor should be tested before you mount it, remove packaging, or let the return window pass. Start with panel defects, then verify uniformity, tone, text clarity, refresh rate, and real content.
Monitor Calibration Guide
Browser tests can help you set a monitor to a sensible baseline and spot obvious problems. They do not replace a colorimeter, but they make brightness, contrast, gamma, sharpness, and banding easier to judge before hardware calibration.
Ready to inspect the full screen?
Open the fullscreen pattern and move through the test slowly.