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Is Your Screen Brightness Even Across the Entire Display?

Display full-screen solid color fields to reveal brightness hotspots, backlight clouding, color temperature shifts, and IPS glow. Essential for evaluating display quality for photo editing and design work.

Tests display uniformity by showing full-screen solid colors (white, black, gray, red, green, blue) at various brightness levels, allowing visual inspection for brightness variation, color shifting, and backlight irregularities across the entire panel.

Even premium monitors can have 10-20% brightness variation from center to corners. Professional-grade displays are factory-calibrated for less than 5% uniformity deviation, which is critical for accurate photo and video editing.

Preview
Uniformity Test

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What Do Your Results Mean?

Result Range Meaning
Good Solid colors appear consistent across the entire screen with no visible hotspots Your display has excellent uniformity. This is ideal for color-critical work like photo editing, graphic design, and video grading.
Warning Slight brightness variation visible in corners or edges on gray/white fields Minor uniformity issues are present, common in most consumer displays. This is generally acceptable for everyday use but may affect critical color work in affected areas.
Poor Obvious bright or dark patches, visible clouding, or color tint differences across the screen Significant uniformity problems that indicate backlight issues (LCD) or panel degradation. This affects image quality noticeably and may warrant a warranty claim if the display is new.

Common Issues & Solutions

Bright patches visible on dark gray or black screens (backlight clouding)

Backlight clouding is a manufacturing variance in LCD panels caused by uneven pressure on the backlight diffuser. Reducing brightness to 30-50% can minimize visibility. If severe on a new monitor, contact the manufacturer for a warranty replacement.

Corners appear warmer (yellowish) or cooler (bluish) than the center

Color temperature shifts across the panel are common, especially on larger displays. Professional monitors with uniformity compensation features can correct this. For consumer monitors, this is a hardware limitation that cannot be fixed with software calibration alone.

Warm glow visible in corners on dark content (IPS glow)

IPS glow is an inherent characteristic of IPS panel technology, not a defect. It appears as a warm glow in corners when viewing dark content, especially from off-angle positions. Reducing room lighting and monitor brightness minimizes its appearance. Viewing from directly in front reduces the effect.

Uniformity varies depending on the solid color being displayed

This can indicate individual sub-pixel uniformity issues. If green or blue fields show worse uniformity than white, specific LED zones in the backlight may be uneven. Run the test in fullscreen mode (F11) and check each color individually to identify the affected areas.

Related Tools

Backlight Bleed Test

Check for backlight bleed on dark screens

Dead Pixel Test

Scan your monitor for dead or stuck pixels

Gradient Banding Test

Test for smooth gradient transitions

Frequently Asked Questions

How do I properly check screen uniformity?

Enter fullscreen mode (F11) and display each solid color one at a time. Start with white and gray at 50% brightness, as these reveal clouding most clearly. Then switch to black to check for backlight bleed. View the screen from your normal position and from slight angles. Test in a dark room for black uniformity and a normally lit room for other colors.

What is the difference between backlight bleed, IPS glow, and clouding?

Backlight bleed is light leaking around the edges of the display, visible on dark screens. IPS glow is a warm, angle-dependent glow in corners specific to IPS panels — it shifts as you change viewing angle. Clouding appears as irregular bright patches across the screen regardless of viewing angle, caused by uneven backlight diffusion. All three are most visible on dark content.

Is some screen uniformity variation normal?

Yes, all LCD displays have some degree of uniformity variation due to backlight design. Edge-lit displays typically show more variation than direct-lit or mini-LED backlights. Variation under 10% is considered acceptable for consumer use. Professional monitors specify uniformity in their datasheets — look for Delta-E uniformity values under 3 for color-critical work.

Can screen uniformity degrade over time?

Yes, LCD backlights can develop uneven aging over years of use, especially if the display frequently shows static content at high brightness. OLED panels are more susceptible to uneven wear (differential aging) where frequently displayed static elements cause permanent uniformity shifts. Running a uniformity test periodically can help track degradation over your display's lifetime.