Backlight bleed or IPS glow? How to tell

Bright corners on a dark screen are either backlight bleed or IPS glow. One is a build defect and one is how the panel works. A head movement tells you which.

By Hardware Detective editorial team · Last updated September 29, 2026 · How we test

You put on a dark film or a loading screen and notice lighter patches in the corners of your new monitor. There are two common explanations and they need very different responses. Backlight bleed is light escaping where it shouldn’t, which is a build quality issue. IPS glow is a sheen that every IPS panel shows to some degree. Returning a monitor for glow usually gets you a replacement with the same glow.

The one test that separates them

Show a full screen of pure black. Dim the room so you can see the corners clearly but not so dark that your eyes fully adjust. Set the monitor brightness to what you normally use.

Now move. Lean left and right, then stand up and step back a meter or two.

• The bright areas stay put and keep their shape: backlight bleed. The light is physically leaking at those spots, so your viewing position doesn’t change it.
• The bright areas shift, fade or swap corners as you move: IPS glow. It depends on the angle between your eyes and the panel, so it changes as soon as you do.
• The bright areas almost vanish when you step back: IPS glow again. Glow is strongest when you sit close to a large screen, because the corners are then at a steep angle to your eyes.

That is usually the whole diagnosis. The rest of this page is about what each one looks like and what you can do about it.

What backlight bleed looks like

An LCD panel doesn’t make light. A backlight behind it shines through all the time and the liquid crystal layer blocks it to make dark areas. Where the frame presses unevenly on the panel or the layers don’t sit perfectly flat, light gets around the edge.

Bleed typically appears as:

• bright wedges or blobs creeping in from the edges, often near the corners
• a yellowish or bluish tint depending on the backlight
• a fixed shape that looks the same every time you turn the screen on

Patches in the middle of the screen rather than at the edges are usually called clouding. The cause is similar and so is the test: they don’t move with your head.

What IPS glow looks like

IPS panels have excellent viewing angles for color but they don’t block light as well at steep angles. Look at an IPS screen from an angle and dark areas pick up a silvery, warm or slightly purple sheen.

Because you sit close to a desktop monitor, you view its corners at an angle even when you’re looking straight at the center. That’s why glow gathers in the corners and why it looks worse on 27 and 32 inch screens than on small ones.

VA panels have much less glow and TN panels shift in color instead. Neither is immune to backlight bleed.

How much is normal?

Almost every LCD monitor has a small amount of bleed or glow when you look for it on pure black in a dark room. That test is deliberately harsher than normal use. A more useful check is to watch a dark scene from your usual seat with your usual lighting:

• If you only notice it on a black test screen, it’s normal.
• If you notice it in dark films or games from your normal seat, it’s borderline and worth raising while you can still return the monitor.
• If you notice it on everyday content with the lights on, it’s a defect.

Retailer return windows are the easiest route for bleed. Manufacturer warranties rarely list backlight bleed as a covered defect unless it is severe, which is why the new monitor checklist puts this test in the first week.

Reducing either one

For IPS glow:

• Sit a little further back or lower the monitor so you view the corners less steeply.
• Add some light to the room. Bias lighting behind the monitor makes glow far less noticeable in the dark.
• Lower the brightness. Glow scales with how hard the backlight is driven.

For backlight bleed:

• Let the monitor warm up for half an hour. Some bleed settles once the frame reaches its normal temperature.
• Check the stand and mount. A monitor arm or VESA plate that twists the frame can press on the panel.
• Avoid the forum advice to loosen or massage the bezel. It sometimes helps but it can crack the panel or void the warranty and it is not reversible if it goes wrong.

While the black screen is up

The same black screen shows stuck pixels as bright dots that don’t move with your viewing angle. The difference from a dead pixel matters for returns. If you’re looking at an OLED screen instead, bleed and glow don’t apply and the thing to check is burn-in on flat gray.