Uniformity Test

Visually compare relative brightness and color consistency across neutral gray and solid-color patterns.

This check opens a focused test surface. You can return with Escape. Review what this browser test can and cannot measure.

Before you start

  • Use steady room lighting and sit centered in front of the display.
  • Keep display brightness and color settings unchanged during the comparison.

How to run this check

  1. Use steady room lighting and view the screen from the center
  2. Start the Uniformity Test in fullscreen
  3. Cycle through brightness levels (0%, 5%, 10%, 25%, 50%, 100%)
  4. Enable the grid overlay to record the location of visible changes
  5. Note the pattern, location, and direction of any brightness or color variation

What this browser test can tell you

Can help you check

  • Relative brightness and color consistency by visual inspection.

Cannot measure

  • This test cannot calculate a calibrated uniformity percentage or Delta E.
Setup, interpretation, and sources

Recommended setup

  1. Use steady room lighting and view the screen from the center.
  2. Compare several neutral gray and solid-color patterns at one brightness setting.

How to interpret what you see

  • Record the pattern, location, and direction of any visible brightness or color shift.
  • Exact uniformity and Delta E measurements require a calibrated colorimeter or imaging colorimeter.

Sources

Methodology reviewed:

💡 Why This Test?

Uniformity describes how consistent brightness and color appear across the screen from a fixed viewing position.

This page can help you document visible variations. It cannot calculate a calibrated uniformity percentage, measure Delta E, diagnose the panel, or apply a universal severity threshold.

✅ What You'll Check:

  • Relative brightness across the center, edges, and corners
  • Changes that move or vary with viewing position
  • Visible patches on neutral gray patterns
  • Relative color consistency across solid patterns
  • The pattern and location of each observation

📖 How to Use This Test

  1. Use steady room lighting and sit centered in front of the screen
  2. Keep your normal display brightness unchanged during the comparison
  3. Click "Start Test" to enter fullscreen
  4. Check each gray level pattern (0%, 5%, 10%, 25%, 50%)
  5. Look at all four corners and edges carefully
  6. Move slightly and note whether a visible patch changes with viewing position

Tip: Record direct observations rather than assigning a cause. Room lighting, display settings, and viewing angle can all change what you see.

📖 Test Guide

What to Look For:

  • • Backlight Bleeding: Light leaking from edges (mainly corners)
  • • IPS Glow: Viewing angle dependent bright spots
  • • Clouding: Uneven patches of light across screen
  • • Vignetting: Darker corners compared to center
  • • Banding: Vertical or horizontal strips of uneven brightness

How to Test:

  1. 1. Dim or turn off room lights
  2. 2. Set monitor brightness to normal usage level
  3. 3. Enter fullscreen mode (F11 or button below)
  4. 4. Check each gray level (0%, 5%, 10%, 25%, 50%)
  5. 5. Look for uneven brightness, especially at edges
  6. 6. Move slightly and record whether an observation changes with angle

The test can continue on this page if fullscreen is unavailable.

Test Patterns

⚠️ Important Notes

  • • Keep room lighting, viewing position, and display brightness steady
  • • Move slightly only when checking whether an observation changes with angle
  • • Camera exposure can exaggerate or hide visible differences
  • • Save the pattern, location, and direction of each visible variation
  • • Objective uniformity requires calibrated measurement equipment

🔧 Common Issues & Solutions

❓ I see bright corners (IPS glow) - is this normal?

Record the corner, pattern, display brightness, room lighting, and whether the patch changes when your viewing position changes.

How to compare: Return to the centered position between checks and keep all display settings unchanged.

What it means: The behavior may have several causes. This page cannot identify panel technology or determine whether the observation is a defect.

❓ Dark spot in center or corners - panel defect?

A dark area that remains visible is an observation to document, not an automatic hardware diagnosis.

Test method: Compare it on several neutral-gray and solid-color patterns at your normal brightness. Note whether it changes with viewing angle or ordinary content.

Next step: If it affects normal use, keep direct-view notes and carefully exposed photos, then ask the manufacturer or retailer to interpret its current support terms.

❓ Entire screen looks cloudy/uneven - what's wrong?

Compare visible patches across 5%, 10%, 25%, and 50% gray without changing settings between patterns.

Record: Note which patterns reveal the variation, its location, and whether it remains visible in ordinary content.

Interpretation: There is no universal pass threshold in this visual test. Use calibrated imaging or luminance measurement for objective uniformity.

❓ One corner much brighter than others - acceptable?

Compare the corner from the centered viewing position on black and several gray patterns.

Documentation: Describe its approximate location and visible extent without converting the browser pattern into a calibrated measurement.

Action: Do not loosen or press the panel. If the observation affects normal content, compare your documentation with the exact product's current support guidance.

❓ Vertical bands of uneven brightness (banding)

Record repeating vertical or horizontal brightness differences on several neutral-gray patterns.

Context: Browser rendering, room lighting, display processing, and the panel can all affect the observation; the pattern does not isolate a cause.

Interpretation: Note whether the lines remain visible in ordinary content. Objective conclusions require calibrated uniformity measurement.