Output
Steady colors, steps or fine-line patterns
UserBenchmark / All Tools / Backlight Bleed Test
Display
Backlight Bleed Test
Use a black screen to inspect edge glow in a dark room.
Free to useNo downloadNo sign-up
Backlight Bleed Test · At a glance
Quick answer: Use a black screen to inspect edge glow in a dark room. Angle-dependent IPS glow can resemble leakage.
Backlight Bleed Test
The test loads when you open it. Device access is requested only after you choose to start.
Detailed guide
How to use this tool
- Display black in fullscreen at normal brightness.
- Inspect the edges from your usual centered viewing position in a dim room.
Input
Manual visual inspection
Browser requirement
Native resolution; fullscreen support
Processing
Runs on your device; no tool-result upload
How it works and what the result means
These are visual inspection patterns. The page cannot read individual panel pixels, measure nits or contrast ratio, diagnose a panel automatically, or repair dead pixels.
Reading the result
Angle-dependent IPS glow can resemble leakage. Camera auto-exposure often exaggerates what is visible to your eyes.
Worked example and assumptions
Steady black field
Inspect edges in a dark room at normal brightness. Changing viewing angle can reveal IPS glow, which should not automatically be treated as backlight leakage.
Inspect edges in a dark room at normal brightness. Changing viewing angle can reveal IPS glow, which should not automatically be treated as backlight leakage.
What to check next
Disable automatic brightness and keep camera exposure fixed if documenting the panel. Compare from the same viewing angle.
Use native screen resolution and 100% browser zoom for fine patterns. Disable adaptive brightness for comparisons. PWM inspection needs an external camera; banding can also be a camera artifact.
Frequently asked questions
Should the room and screen both be at maximum darkness?
Use conditions relevant to normal use. Maximum brightness in a completely dark room can overstate a subtle effect and makes comparisons less representative.
How do I start the Backlight Bleed Test?
Choose a pattern and open fullscreen. Inspect the entire panel, then click to cycle patterns. Press Escape to leave fullscreen.
Does this tool require a download or an account?
No. Open the interactive tool above in a modern browser. The instructions and explanations are available even with JavaScript disabled; running a test needs JavaScript.
Why can two attempts give different results?
Power settings, background tasks, browser scheduling, operating-system input processing and device settings affect measurements. Compare repeated attempts with identical settings rather than the single highest score.