Backlight Bleed and IPS Glow

Move your head. If the bright area shifts or fades as you change position, it is IPS glow and it is how the panel works. If it stays exactly where it is, it is backlight bleed and it is an assembly defect.

That test takes ten seconds and it decides whether you are returning a monitor or getting used to one.

A note on this guide: this rests on how LCD panels are constructed and lit, not on panels measured here. See how we test.

The problem, as it appears

A new monitor, a dark scene or a black desktop, and the corners are not black. There is a pale wash across one corner, or a bright streak along an edge.

The internet supplies two contradictory answers immediately: that this is a defect and you should return it, and that this is completely normal and everyone has it. Both are true, of different things.

Why "is this normal?" is the wrong question

Because there are two separate phenomena with the same description, and they have opposite answers.

IPS glow is a consequence of how in-plane switching panels work. Light passes through the liquid crystal layer and, viewed off-axis, more of it reaches your eye than the panel intended. Every IPS panel does this. It cannot be manufactured away and it is not a fault.

Backlight bleed is light escaping around the edge of the panel where it is not sealed cleanly against the frame. That is an assembly tolerance, it varies unit to unit, and a bad example is a legitimate reason to send one back.

So "is this normal" cannot be answered until you know which one you are looking at — and the two require completely different responses.

What actually matters

The head-movement test separates them

Sit centrally in a dark room with a black image on screen. Note what you can see.

Now move: left, right, up, down, closer, further.

• Changes, fades, or migrates to a different corner → glow. It is angle-dependent because it is caused by your viewing angle.
• Stays exactly where it is, unchanged → bleed. It is a fixed light leak and your position is irrelevant.

Most monitors show some of both, and the test tells you which is dominant.

Judge it in the conditions you actually use

A black screen in a completely dark room is the worst case, deliberately. It is the correct test condition for identifying the problem and the wrong one for deciding about it.

The question that matters is whether you can see it while doing what you normally do, at your normal room lighting. A great deal of bleed that looks alarming in a dark room is invisible during ordinary use, and returning a monitor over something you can only provoke in a blackout is a poor trade.

Do not press on the bezel

This circulates widely as a fix and it deserves a direct warning. The advice is to apply pressure around the affected area to reseat the panel.

You are pressing on a liquid crystal panel to address a cosmetic issue. The realistic outcomes are no change, temporary change, or a permanent pressure mark — and the last one is a genuine defect replacing a cosmetic one.

Bias lighting changes what you notice

Neither phenomenon can be removed, but both are most visible against a dark surround, because your eye is judging the screen against the wall behind it.

Raising the light level behind the monitor compresses that contrast, and both bleed and glow become much less obvious. It is a perceptual fix rather than a panel fix, and for glow in particular it is the only thing that helps at all.

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Whether it does anything for eye strain is a separate and more contested claim, handled in does bias lighting reduce eye strain.

Panel technology is a real trade

If black uniformity genuinely matters to you — dark films, dark games, photo work — that is a reason to weigh panel type at purchase rather than to fight the one you have. IPS trades black-level performance for viewing angles and colour, and other technologies make that trade differently.

That belongs in the buying decision alongside the other trade-offs in refresh rate versus resolution.

The mistake to avoid

Returning a monitor repeatedly for glow. Every replacement will have it, because it is the technology rather than the unit, and the process costs everyone time while arriving at the same screen. Establish which one you have first — the head-movement test is free and conclusive.

The second mistake is judging within the return window and then deciding later. Manufacturers commonly treat mild bleed as within specification, so warranty is a weaker route than a retailer return. If it is genuinely bad enough to bother you in normal use, decide inside the return period rather than hoping it becomes acceptable.