How to test your monitor for backlighting – backlighting – WePC

The last thing you want to see when you turn on your brand new LCD monitor is the backlight bleeding. This dreaded screen error can affect the quality of games, the display of entertainment, the color accuracy and the general sharpness of your monitor.

If you are unlucky enough to buy a monitor with particularly strong backlighting, you should be able to return the panel and get a full refund – provided you have the appropriate warranty / return policy.

The following article will discuss; How to check if the backlight is bleeding, examine some of the main differences between backlight and IPS glow, and finally test how you can test your monitor and prevent the backlight from bleeding.

So let’s not waste any more time after everything that is said and dive right in!

What is backlight?

The backlight is a screen error found on all LCD (and LED) monitors. To better understand how backlights appear, we first need to understand how an LCD panel is built.

LCD panels consist of numerous layers, one of which is a backlight. Because LCDs do not produce light themselves, they need backlighting to produce the light needed to create the images displayed. Without it, the monitor would be useless.

With the backlight, however, all of your light comes out. Since some LCD monitors cannot block the light particularly well, the light source of the LCD can creep through the edges. This bleeding can wash out images, reduce the color accuracy of your image, and decrease the experience received.

Ultimately, backlight bleeding is a limitation of the LCD design. When you buy an LCD monitor, you will most likely have to endure backlighting yourself. Just hope the light bleeding is subtle and you barely notice it.

Backlight bleeds against IPS Glow

Apart from that, there are many cases where certain people mistake the IPS glow for backlighting. However, these are two very different screen errors.

IPS lighting only applies to IPS panels (in-plane switch). It happens just around the corners of the monitor and shows a slight orange glow – change in intensity when you look at the panel from different angles. It differs from the backlight in a few basic points:

First, the backlight bleeding does not change its intensity when you look at it from different angles. The backlight bleeding is constant at all times in terms of intensity. Second, there may be background bleeding all over the edge of the monitor, not just the corners. Because backlight bleeding is a factor caused by the backlight itself, unlike IPS glow, it is not tailored to the corners of the panel.

Unfortunately, and like backlighting, IPS glow can never be completely prevented – it’s part of the monitor design. However, it varies quite dramatically when comparing budget monitors to high-end offerings.

How to test for backlight

If you are concerned that your monitor is backlit, you will be pleased to hear that there are a number of easy ways to determine if your monitor has this annoying screen error. Ultimately, all you have to do is find a large image of a black image that fills your display. Adjust the brightness of your monitor to 30-60% and check if lighter areas come through the black image.

If you’re having trouble finding a black picture, just use one of the many YouTube videos available and play it in full screen mode.

If you see too much light when looking at the black image, there is a high possibility that your monitor will be classified as defective. This means that you will receive a full refund. However, if the slight bleeding is minor, you probably won’t notice it when playing or watching movies.

This will prevent the backlight from bleeding out

As mentioned above, all LCD monitors have backlighting that prevents this from really not being possible. However, there are best practices that you can always incorporate into the use of a monitor to reduce the effects of backlight bleeding.

  • Try to keep your brightness at around 30%. This slows down the deterioration of your monitor and reduces the intensity of light bleeding.
  • Try not to keep your monitor on all the time. Turning it off in the evening can reduce monitor degradation.
  • Try not to strain your monitor too much. Hitting, tapping, and hitting the monitor can cause the backlight to bleed more.


Ultimately, although backlight bleeding is annoying, it’s not the most pressing issue you’ll ever have when using a monitor. In most cases the monitor will be exchanged for a new one by the dealer from whom you bought the monitor or you will receive a full refund. Bleeding out the backlight is not a new concept. Therefore, some recognition should be required to inform the retailer of this problem.

Although there is no physical solution to backlight bleeding, you can start practicing good monitor maintenance in your everyday life. This not only reduces the likelihood of screen errors like these, but also ensures that your monitor is running at an optimal level.

If you have any questions about backlight bleeding, please write us a comment in the section below. We will get back to you as soon as possible. Better yet, visit our Community Hub, where you can discuss anything related to like-minded people.

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