Backlight Bleed Test
Check if light leaks through the edges or corners of your LCD panel in dark conditions.
Light uniformity on a solid black background is visually inspected for edge or corner glow. Click Start Test, go fullscreen in a dark room, and observe the edges carefully.
What does this test measure?
Light uniformity on a solid black background is visually inspected for edge or corner glow.
Why is this test important?
Check if light leaks through the edges or corners of your LCD panel in dark conditions.
How do you run the test?
Click Start Test, go fullscreen in a dark room, and observe the edges carefully.
How should results be interpreted?
Visible bright patches at edges or corners indicate backlight bleed.
Normal and problematic results
Visible bright patches at edges or corners indicate backlight bleed.
Technical limitations
OLED panels do not have a backlight; this test applies only to LCD or IPS displays.
Why can the score decrease?
Unstable measurements, denied permissions, unsupported browser APIs, background load, power saving, or an incomplete test can affect the result. When a score changes, the result screen explains the reason.
What should you do if a problem is found?
Reduce display brightness, claim warranty replacement, or adjust panel pressure points.
Example Result Explanation
Frequently Asked Questions
Does this test provide a definitive hardware diagnosis?
No. The test measures signals the browser can safely access and clearly explains its technical limits.
Why can results change between runs?
Background applications, power mode, network conditions, permissions, and operating-system timing can affect results.
How should I repeat the test if I see a problem?
Repeat it on the same device and browser while changing only one condition, so the source of the difference is easier to identify.