How Does an LCD Inverter Work?

By content at November 28, 2012 17:40
Filed Under: Laptop LCD Screen
Many users who have performed some sort of repair on a laptop have replaced an LCD inverter, or are at least familiar with the term. What does an LCD inverter actually do, and how does it work? Let us take a look at the ins and outs of an LCD inverter in a laptop.

An LCD (liquid crystal display) panel uses multiple components to create the image you see on the screen. The liquid crystals are arranged in a layer near the front of the screen. As the crystals rapidly change color, they create an image. This image would not be viewable, however, without a backlight. The backlight is located behind the crystal layer and shines through the crystals to provide enough light for the users to see the image.

The backlight of an LCD screen is one of the most power-hungry components of any laptop, and it generally requires AC power rather than the DC power provided by the laptop’s power supply. This is where the inverter comes in. The inverter converts the DC (direct current) that comes from the laptop’s power supply to the AC (alternating current) that is needed for the backlight of the LCD screen.

Strangely, the power coming from a wall outlet is already AC power, then the AC adapter converts this power to DC for the laptop, then the inverter converts it back to AC power for the backlight. This is necessary, however, as the battery of a laptop can only provide DC power, and the inverter allows manufacturers finer control over the exact wattage of the AC power that is sent to the backlight, which can help reduce power consumption as well.

The LCD inverter is an important component of a laptop’s display. Without it, the backlight could not receive enough power to make a sharp and bright image, and a laptop would not be useable.