Panel & Backlight
Backlight Bleed Test
Reveal LCD backlight leakage and IPS glow in a dark room.
▶ Start full-screen testBlack← / → or tap the sides to switch · Esc to exit
How to use
- 1Turn off room lights and set brightness to maximum.
- 2Click Start for a full-screen black field.
- 3Inspect the edges and corners for cloudy or glowing patches.
- 4Press Esc to exit.
FAQ
Is some backlight bleed normal?
Yes. Almost all LCD/LED panels have minor bleed. It's only a problem when it's uneven, distracting in normal use, or excessive in the corners.
What's the difference between bleed and IPS glow?
Backlight bleed is light leaking through the panel edges and is visible head-on. IPS glow is a viewing-angle effect that shifts as you move your head.
Tips
- Photograph the black screen with your phone to compare panels objectively.
- Some bleed and IPS glow is normal — only uneven, distracting clouding is a defect worth returning a panel over.
Related tests
Dead Pixel TestFull-screen solid colors to find dead, stuck, and bright pixels.Open test→Brightness UniformityA 50% gray field, a 9-zone grid and a panning gray to spot uneven backlighting.Open test→Blooming TestA bright object on black to judge local-dimming halos.Open test→Burn-in TestFull-screen fields and a checkerboard to reveal OLED burn-in.Open test→
Related guides
Learn more about what this test reveals and how to act on the results.
Backlight Bleed vs IPS Glow: What's the Difference?Both show up as light on a black screen, but they're different problems. Learn how to tell them apart and what's normal.What Is Backlight Bleed and Is It Normal?Light leaking around the edges of an LCD is common, but not always acceptable — when to shrug it off, and when it's grounds for a return.What Is IPS Glow (and How to Reduce It)?That silvery corner shine on IPS panels is a viewing-angle effect rather than a defect — how to tell it from bleed, and how to reduce it.IPS vs VA vs TN vs OLED: Which Panel Should You Get?Color, contrast, response speed and viewing angles compared across all four panel types, with the right pick for gaming, work and movies.