Backlight Bleed Checker
Check for backlight bleed and IPS glow on your LCD display in a dark environment. This test helps identify uneven backlighting that appears as bright spots or clouding in dark areas.
Before You Start
- Turn off room lights: Test in a completely dark environment
- Set brightness to 100%: Maximum brightness shows bleed most clearly
- Allow warm-up: Let your monitor run for 10-15 minutes
- Use multiple gray levels: Different shades reveal different issues
How to Use
- Enter Fullscreen: Click the button below
- Navigate Levels: Use arrow keys, spacebar, or swipe on touch devices
- Look for bright spots: Check corners and edges especially
- Exit: Press Escape or click the exit button
Understanding Backlight Bleed
What is Backlight Bleed?
Backlight bleed occurs when light leaks around the edges or corners of an LCD panel, appearing as bright patches on a black screen. It's most visible in dark scenes and dark rooms.
Types of Display Issues:
- Backlight Bleed: Bright spots along edges or corners (manufacturing defect)
- IPS Glow: Whitish glow at viewing angles (normal for IPS panels)
- Clouding: Uneven brightness across the panel (backlight uniformity issue)
Is Some Bleed Normal?
Most LCD monitors have at least minor backlight bleed. A small amount in the corners is considered acceptable. Severe bleed that's visible in normal use or covers large areas may warrant a return or replacement.
Remediation Tips:
- • Loosen bezel screws slightly (if comfortable disassembling)
- • Apply gentle pressure around problem areas (temporary fix)
- • Reduce brightness for everyday use
- • Enable local dimming if available
- • Contact manufacturer if severe (within warranty period)
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Disclaimer: This tool is provided as-is for informational purposes. Some backlight bleed is normal and expected in LCD displays. This test may make minor bleed appear more severe than it would in normal use. Use this test as a reference only, not as definitive proof of a defect.