Backlight Bleed Test — Here’s Everything You Need to Know

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Backlight bleed is one of the most hated issues in LCD and LED monitors. The last thing anyone wants on their new monitor is a defect. The backlight bleed can lower the color accuracy of the screen or affect your visual experience in a bad way.

However, if you have purchased your display from a reputable brand, then you have got nothing to worry about. You can conduct a backlight bleed test, and if there is any backlight bleed, the company will replace the device for you.

Most reputable brands cover the light bleed defect in their replacement warranty and offer a free refund in case the customer does not want a replacement.

So, to conduct a backlight bleed test effectively, first of all, you need to know what the backlight bleed is and how it is caused.

What is Backlight Bleed?


Backlight bleed is a defect found in LCD and LED displays. It is a defect caused by the leaking of light from the backlight panel on the screen. The Backlight bleed can diminish your visual experience.

The LCDs are designed in a multi-layered fashion because they do not have any light of their own. So, a backlight panel is integrated which provides the LCD with the light it needs to create visuals for you on the screen.

The empty space, cracks, and other defects in the construction of the display can allow the backlight to leak from the surface and appear on the edges or corners of your screen. It is called backlight bleeding.

Is Backlight Bleed a Major Issue?

The backlight bleed is sometimes too minor to notice, so if it is not hindering your visual experience or if you cannot observe it even minutely without the test, then it won’t be a problem for you.

However, if you feel the glow on the normal screen while watching movies or playing games, then you should conduct a backlight bleed test to see how much of your screen is suffering from backlight bleeding.

All of the LCD screens will have some backlight bleeding when in use. However, you must not accept a new LCD screen with backlight bleed, since you can claim a warranty for a replacement.

However, once you start using the screen, after some time, the backlight bleed can pop up. It won’t be much if you use your monitor carefully and it won’t increase in its intensity. As long as the backlight bleed is not visible on a normal screen, it won’t create any problems.

How is Backlight Bleeding Different from IPS Glow?


Before we get to the backlight bleeding tests, let’s briefly discuss an issue with is often confused with backlight bleeding. The IPS Glow is also a glow on the screen which is often confused as a backlight bleed.

The IPS panels are designed to provide wide viewing angles. However, sometimes they suffer from an orange glow in the corners of the screen, especially when you look at it from different angles.

The glow is of orange color and changes its intensity when you change the angle of the screen. This is a common defect of IPS displays and must not be confused with backlight bleeding.

The backlight bleeding is consistent and happens not in just corners but also around the edges. It is not limited to any one color and also is consistent, which means it does not change intensity.

How to Conduct a Backlight Bleed Test?

Now to the most interesting part, how you can conduct a backlight bleed test on your own?

Well, luckily there are a lot of simple and easy ways that allow you to conduct backlight bleeding tests. The most simple of them is to find a pitch-black image and open it on full screen. You will be able to notice any light bleeding from the corners or edges.

Also, you must increase the brightness of your screen by 60-70% in order to see the backlight bleed clearly.

If you are unable to find a pitch-black image, you can open a video, video and observe closely if there is any bleeding. You will have to increase brightness and play the video in full-screen mode.

If the light bleed is minor or unnoticeable without the test, then the monitor will work just fine. You won’t be able to notice any difference while playing games, watching movies, or working.

Two Types of Backlight Bleeding

Modern monitors and massive screens have different sorts of backlight bleeding which is not just limited to the edges. Hence, the backlight bleeding has been divided into two types:

The first type is flash-lighting or corner-bleeding. The most common type of backlight bleeding occurs in almost all of the displays. The bleeding will be visible from the edges or the corners.

Clouding or Cloud-bleeding is a type of bleeding which occurs in larger displays. You will be able to observe irregular patches of backlight bleeding on the display.

Why should I use a Backlight Bleed Test tool?

Most often than not you have difficulty looking for a pitch-black image or a video that can help you accurately identify the backlight bleed or color bleed on your screen.

A backlight bleed test tool can remove the hassle and provides you with a perfect tool to conduct a backlight bleed test.

The tool can be accessed on A Blog and allows you to conduct both backlight bleed tests and color bleed tests on your screen.

The tool is simple to use. You simply need to select a color that you want to test the bleed for and begin the test. You can move to different colors using the arrow keys. For backlight bleed, select the pitch-black color.

How to do a monitor backlight bleed test?

You just need to follow the following simple steps:

  1. First of all, turn off the lights in the room. A dark room will allow you to test the light bleed more accurately.
  2. Adjust the brightness of your monitor’s screen. You can set it from 30% to 60%. Never set it to 100%.
  3. Open a pitch-black image or use the backlight bleed test tool.

How to do a backlight bleed test on a smartphone or tablet?

Backlight bleed problems do not just occur in monitors and TVs. All the devices that have an LCD or LED screen can suffer from backlight bleed. The process for testing the backlight bleed is similar for all devices.

  1. First, you need to sit in a dark room or turn off the lights around you so that you can test the backlight more effectively.
  2. Adjust the brightness of your smartphone’s or tablet’s screen. You must never set it to the maximum.
  3. Open a pitch-black image, play a pitch-black video or use the backlight bleed test tool to test the backlight bleeding.
  4. There is also a variety of apps on Playstore and App Store that you can use to conduct the backlight bleed test.

If your smartphone has a backlight bleed when you have just purchased it, or if the warranty still covers it, you can get a replacement or get it fixed for free.

How to Fix Backlight Bleeding on a Monitor?

Well, there is no way to fix the backlight bleeding 100%. However, there are some methods that you can use to fix the backlight bleed on your monitor.

First of all, if the backlight bleed is minor or you do not feel it without the backlight bleed test, then you should not worry about it. Just take the necessary precautions that can help you prevent further backlight bleeding.

If the backlight bleed is too much and it is affecting the visual quality of the monitor, then your first option is to get the monitor replaced if it is still covered by warranty.

If not, then you can use one of the following methods to reduce backlight bleeding.

1. Loosening the Screws

The backlight bleeding might be occurring because the screws at the back of your monitor are too tight. You can try solving it by following these steps.

  • Turn off your monitor and wait for a few minutes for it to cool down.
  • Loosen the screws at the back of your monitor.
  • Turn it on again and see if the problem is resolved.

2. Using a Microfiber Cloth

Another method that you can use to reduce the backlight bleed is by using a microfiber cloth. Here are the steps.

  • Conduct a backlight bleed test using the backlight bleed test tool and mark the areas where backlight bleeding occurs.
  • Turn off the monitor and wait for a few minutes for it to cool down.
  • Gently rub the areas where the backlight bleed occurs in a circular manner. Remember not to apply too much pressure, otherwise, you will only end up causing more damage.
  • Turn on the monitor again.

Is the issue resolved?

These methods are not 100% sure to work. They might work in reducing the backlight bleed. There is no solution to fixing the backlight bleed problem completely.

However, if there is only a minor backlight bleed, then you can prevent it from advancing.

How to Prevent Backlight Bleed on Your Monitor?

If you have got a new monitor and hate for it to suffer from backlight bleeding, or if your monitor is already suffering from backlight bleeding and you want to prevent it from spreading further, then you must adhere to the following precautions.

  1. Do not keep your monitor turned on at all times. You must turn it off when you are not using it. Letting it cool down once a day will prevent backlight bleeding.
  2. Never keep your brightness to 100% unless you absolutely need it. Even then you must lower it back to average once your task is finished.
  3. If your monitor has backlight bleeding, never try to solve it using force. Hitting the monitor or rubbing it harshly will only worsen the problem.

Taking these precautions will help you prevent the backlight bleed from going intense.

Frequently Asked Questions

  1. Can you fix the backlight bleed?

    Well, you cannot fix it 100%. However, there are a couple of methods that you can use to fix the backlight bleeding to a certain extent. We have shared these methods in the above guide. Your last option will always be to replace the monitor

  2. Is backlight bleeding a defect?

    Yes, backlight bleeding is a commonly occurring defect in LCD and LED screens. Fortunately, if there is any backlight bleed when the device arrives or during the warranty period, you can claim a free replacement or refund depending on the company’s policy.

  3. How do you check backlight bleeding?

    There are certain ways to check backlight bleeding. You can simply open a pitch-black image on the screen, play a pitch-black video or use one of the advanced backlight bleed tools to test the defect.

  4. Is backlight bleeding normal?

    Yes, backlight bleeding is a normal issue. Normally, this issue is not noticeable without the test and would not hinder the visual performance of your device. However, if the issue starts appearing on a normal screen, then you’ll have to take measures to stop it.

  5. Does backlight bleed go away?

    Unfortunately, the issue does not go away. Once your screen has a backlight bleed, you can never solve it completely. However, there are certain precautions that you can take to prevent it from spreading further. We have shared them in the above guide.

  6. Is backlight bleeding a big problem?

    Normally, it is not a big problem. Minor backlight bleeds occur all the time and they are unnoticeable. However, if the problem increases in intensity, it will affect the visual performance of your device and you will need to get the device replaced.


Backlight bleeding is a commonly occurring issue in LCD and LED screens. You can conduct the backlight bleed test using a pitch-black image, video, or our advanced backlight bleed test tool. The test will allow you to accurately determine the areas where the backlight is bleeding out. The issue is common and will not bother the visual performance of your device. However, if it increases in intensity, you will have no other option but to replace your device.

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