Technology News

Backlight Bleeding: A LCD Problem

Views : 154
Update time : 2018-03-12 17:05:55

The entire surface of a LCD panel is backlit from behind by a light source (CCFL or LED) and the LCD blocks out the light that is not needed when displaying a particular image. Backlight bleeding most commonly occurs when this light is not 100% blocked, allowing excess light to "bleed" around the edges of the LCD panel. This backlight bleeding issue leaves spots of lighter areas on a dark or black background.


Unfortunately, many LCD monitors suffer from at least a small amount of backlight bleed because the opacity of LCD panels and construction materials used in the monitor manufacturing process are not high enough to completely block all light. This will usually only cause problems if the backlight bleeding can be easily detected by the human eye. The graphic to the right shows an example of what an LCD display with excessive backlight bleeding looks like with a dark, static background. As you can see, the top left and bottom right corner are lighter in color than the center of the display.

Fixing Backlight Bleed

In general, there is no definite fix for backlight bleeding other than completely dismantling the monitor and adding extra light blocking materials (such as black electrical tape) around the LCD panel. Some users in this thread have had success improving the level of bleed on the model 2005FPW Dell LCD using the method listed. Note: Dismantling of a LCD monitor in an attempt to reduce backlight bleed should be done at your own risk and only as a last resort if the monitor is no longer under warranty and can't be returned or exchanged.

The best way to "fix" backlight bleed is to have the monitor exchanged if the retailer will allow it and take your chances with a new LCD panel, hopefully one with less bleed. The ideal solution is to do your homework and in the future avoid monitors with a history of backlight bleeding and other quality control issues.

How To Avoid Backlight Bleed When Buying A New Monitor

Read reviews on the model of LCD display you plan on purchasing beforehand and look for any complaints about backlight bleeding. Buy from a retailer that will allow you to exchange the display if there are any major problems and, if possible, try to view a display model or two before making a purchase. You should also avoid LCD monitors from brands which are known to have quality control problems, as they will be much more prone to display inconsistencies such as backlight bleeding.

Even this does not guarantee you will receive an LCD completely free from bleeding, but it can limit the chances and give you a higher success rate.

Related News
INNOLUX Has Become Gou's Second Trump Card Besides Foxconn INNOLUX Has Become Gou's Second Trump Card Besides Foxconn
May .31.2020
As a high-tech group specializing in 3C products and semiconductor equipment, Foxconn has become the world's largest professional electronics manufacturer, with revenue of 408.698 billion yuan in 2019, and it has also become Terry Gou's biggest trump card
Discussion On LCD Soft Screen And Hard Screen Technology Discussion On LCD Soft Screen And Hard Screen Technology
May .29.2020
In the past 10 years, wide-view LCD technology has been completely divided into two types: vertical-oriented soft screen and horizontal-oriented hard screen. PSVA, HVA (CSOT) and UV2A (Sharp) all belong to the soft screen VA technology, while the horizont
COVID-19 Boomed Medical LCD Panel Market COVID-19 Boomed Medical LCD Panel Market
May .27.2020
The spread of the COVID-19 epidemic has led to a surge in global demand for medical equipment, leading to buoyant shipments of medical lcd panel orders in the first half of this year.
BOE Low Blu-ray Display Solution Is Certified By T Ü V Rheinland BOE Low Blu-ray Display Solution Is Certified By T Ü V Rheinland
May .21.2020
On May 20th, T Ü V Rheinland Group, a global third-party testing, inspection and certification body, jointly held an online press conference with EyeSafe. As one of the first Eyesafe display standards and T Ü V Method2 certified enterprise, BOE 7 low Blu-