Backlight bleed test

A black screen and a gray one — is the whole surface evenly lit?

What is backlight bleed?

The screen is black, but a corner or a stretch of the border sits there faintly lit. That's thebacklight escaping through the gap between the panel edge and the frame — an assembly tolerance, so it varies unit to unit. Invisible while you work in daylight, obvious the moment you kill the lights and start a film.

One of the three isn't a fault

People lump it all under "bleed," but the causes differ. IPS glow is a viewing-angle property of the panel. Every IPS screen has it to some degree. It is not a defect.

Mistake it for bleed and exchange the unit, and the next one does the same thing. If the bright area follows your head when you move, that's glow.

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A black screen and a gray screen, one after the other. You're looking at whether the whole surface is evenly lit, not for a single dot.

Darken the room. With lights on, the room reflects off the panel and mixes with the bleed.
Give your eyes a minute or two. A black screen looks more even than it is before they adapt.
Use your normal brightness. Crank it to maximum and every panel bleeds.
Look once head-on, once from an angle. Those two views are what separate IPS glow from bleed.

Black
Gray

Tap the screen or press →← for the next screen; ESC ends it

On the black screen, was any corner or edge lit up?

Was the gray screen cloudy or blotchy, or did a corner look yellow or blue?

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Not sure what the result means?Backlight bleed or IPS glow, and where normal ends

Bleed, glow, and clouding are different things

	Shows on	Change your angle	A fault?
Backlight bleed	Black	Stays put	Depends on degree
IPS glow	Black	Follows you	No
Clouding / mura	Gray or white	Stays put	Depends on degree

On OLED the first two don't apply. Each pixel makes its own light and there's no lamp behind it, so there is structurally nothing to leak. Something floating on an OLED black is a reflection or image retention.

Photos always look worse than the screen

Photograph a black screen in a dark room and the camera pushes the exposure up on its own. What your eye reads as a faint glow comes out looking like a flashlight. Most of the "is this bad?" photos posted to forums are in that state.

It cuts the other way too. Send that photo to support and they read it as exaggeration — including the times the real thing genuinely is bad. Writing it down beats photographing it:

Which area — quarter the screen; "bottom-left corner" is precise enough
At what brightness — your normal setting, or only at maximum
What it interferes with — "it sits next to the subtitles in a dark film"

That last one carries the most weight. Naming the use beats arguing about degree.

Thresholds exist. Your warranty just doesn't cite them

"There's no standard for bleed" is the usual line, and it isn't accurate. The display ergonomics standardISO 9241-303 covers luminance uniformity and asks that it stay within 1.7:1 across the screen. That is measured on white and gray, not on black, so it is not a bleed threshold. Some products sell uniformity as a spec and ship a per-unit measurement report.

The problem sits elsewhere. Consumer laptop and monitor warranties mostly say nothing about how much bleed is acceptable. The same document sets a dead-pixel count and skips luminance uniformity entirely. Not because no standard exists, but because that product doesn't warrant against it.

Which means inside your return window there is nothing to argue about. It's a period where change of mind is enough, so "is this within spec" isn't the question. After it closes, the call passes to them (return rights).

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