Backlight Bleed Test
Dim the room, enter the fullscreen black picture and click to toggle the guide marks — scan the corners and edges for white or yellowish glow patches.
Best in a dark room at 70–100% brightness. Click toggles guide marks, Esc exits.
How to check
- Dim the room first — bleed is invisible under bright ambient light. Set brightness to your normal level (70–100%).
- Scan the four corners and the top/bottom edges — whitish or yellowish patches that stay put when you move your head are bleed.
- Glow that shifts as you change viewing angle is IPS glow, a panel trait — mild cases are normal, not a defect.
- For evidence, lower phone exposure until the photo matches your eyes and note the brightness level; overexposed shots exaggerate.
Frequently asked questions
Backlight bleed vs IPS glow — how do I tell them apart?
Bleed is fixed: a whitish area along an edge or corner that stays put as you move your head. IPS glow is a panel trait that shifts with your viewing angle. Glow that changes when you press the bezel lightly is pressure bleed from assembly. Mild glow is normal.
How much bleed is acceptable?
Slight corner glow at moderate brightness in a dark room is common. If bright patches are visible during normal video or reading, or the bleed is large and clearly uneven, that's a quality issue — photograph it and use the warranty.
Tips for photographing it as evidence?
Phone night modes exaggerate mild bleed badly: lower the exposure manually until the photo matches what your eyes see, and note the screen brightness level and environment — an overexposed shot undermines your claim.
Should laptops be tested too?
Yes. Narrow bezels put more assembly pressure on the panel, making bleed more common — especially along the bottom edge and beside the hinges. At 70–100% brightness in the dark, sweep all four edges and corners.