What causes poor screen uniformity?

Screen uniformity issues are caused by uneven backlight distribution, variations in the LCD layer, or physical pressure on the panel. Edge-lit displays tend to have more uniformity issues than full-array local dimming displays.

What is clouding and is it normal?

Clouding appears as lighter, hazy patches on dark backgrounds. It's caused by pressure on the LCD panel affecting how light passes through. Some clouding is considered normal for LCD monitors, but severe cases may warrant a warranty claim.

How much non-uniformity is acceptable?

For general use, if you don't notice uniformity issues during normal content viewing, your monitor is fine. For professional photo or video work, brightness should vary less than 10% across the screen, and there should be no visible color tinting.

Screen Uniformity Test

Display solid colors fullscreen to reveal clouding, brightness variations, color tinting, and banding across your monitor.

💡 Is my screen uniform?

A perfectly uniform screen would show identical brightness and color from edge to edge. In practice, most monitors have some variation. Look for obvious cloudy patches, yellowed corners, or brightness falloff at the edges. If the variations are only visible on solid colors and not during normal use, your monitor is likely fine.

How this test works

The test fills your screen with solid colors — white, gray, and primary colors. An optional 5×5 grid overlay helps you compare brightness and color consistency across different screen regions. Look for areas that appear brighter, darker, or tinted differently from the center of the screen.

Frequently Asked Questions

What causes poor screen uniformity?: Screen uniformity issues are caused by uneven backlight distribution, variations in the LCD layer, or physical pressure on the panel. Edge-lit displays tend to have more uniformity issues than full-array local dimming displays.
What is clouding and is it normal?: Clouding appears as lighter, hazy patches on dark backgrounds. It's caused by pressure on the LCD panel affecting how light passes through. Some clouding is considered normal for LCD monitors, but severe cases may warrant a warranty claim.
How much non-uniformity is acceptable?: For general use, if you don't notice uniformity issues during normal content viewing, your monitor is fine. For professional photo or video work, brightness should vary less than 10% across the screen, and there should be no visible color tinting.

More monitor tests

← More monitor tests Backlight Bleed Test →Contrast Ratio Test →

Written by MouseTesting Team

Reviewed by MouseTesting Engineering • Last updated: January 2026