What causes backlight bleed?

Backlight bleed occurs when the LED backlight leaks around the edges of the LCD panel frame. It's caused by uneven pressure on the panel, manufacturing tolerances, or the panel design itself. It's most visible on dark content in a dark room.

Can backlight bleed be fixed?

Minor backlight bleed sometimes improves over time as the panel settles. Some people have had success gently loosening the bezel screws to reduce pressure on the panel, but this risks voiding your warranty. Lowering backlight brightness reduces the visibility of bleed.

Is backlight bleed covered by warranty?

Most manufacturers consider minor backlight bleed to be within acceptable tolerances. Severe cases — where the bleed is clearly visible during normal use — may qualify for warranty replacement. Check your manufacturer's dead pixel and uniformity policy.

Backlight Bleed Test

Display a pure black screen to reveal backlight bleed, IPS glow, and light leaks around the edges of your monitor.

💡 Does my monitor have backlight bleed?

Run this test in a completely dark room with your monitor at normal brightness. If you see lighter areas — especially at the corners or edges — your monitor has backlight bleed. Some amount is normal for LCD displays. If the bleed is only visible in a dark room and doesn't bother you during normal use, it's generally acceptable.

How this test works

The test fills your entire screen with a very dark or pure black image. In a dark room, any light leaking through the LCD panel becomes visible as brighter patches — typically at the corners and edges. You can adjust the brightness level from 0 (pure black) to 30 to see how your backlight behaves at different near-black levels.

Frequently Asked Questions

What causes backlight bleed?: Backlight bleed occurs when the LED backlight leaks around the edges of the LCD panel frame. It's caused by uneven pressure on the panel, manufacturing tolerances, or the panel design itself. It's most visible on dark content in a dark room.
Can backlight bleed be fixed?: Minor backlight bleed sometimes improves over time as the panel settles. Some people have had success gently loosening the bezel screws to reduce pressure on the panel, but this risks voiding your warranty. Lowering backlight brightness reduces the visibility of bleed.
Is backlight bleed covered by warranty?: Most manufacturers consider minor backlight bleed to be within acceptable tolerances. Severe cases — where the bleed is clearly visible during normal use — may qualify for warranty replacement. Check your manufacturer's dead pixel and uniformity policy.

More monitor tests

← More monitor tests Dead Pixel Test →Screen Uniformity Test →

Written by MouseTesting Team

Reviewed by MouseTesting Engineering • Last updated: January 2026