How a Laptop Display Is Assembled?

A laptop's LCD screen displays images using several components which make up the laptop's display assembly. A generic display assembly consists of an LCD panel, a backlight lamp, an inverter board, the video card attached to the motherboard and associated cabling. Problems with one or more components in the display assembly may cause the laptop's display to malfunction.

Function

• An LCD panel displays images onscreen using light from a long, thin lamp mounted to a side of the screen, known as a cold cathode fluorescent lamp (CCFL) backlight. Another component, the inverter board supplies power to the backlight lamp to illuminate the screen. Light from the lamp is then distributed over the panel, according to the image being formed.

Process

• The video card attached to the motherboard is responsible for generating images which tell the LCD screen what to display. The video card sends signals to the LCD screen via a thin, ribbon-like cable known as the video cable. The video card's signals are then translated to onscreen images, using the backlight lamp to light the screen, and the inverter board to supply power to the backlight.

Warning

• The lid close switch is a small switch located near the laptop's hinges. The purpose of the switch is to turn off the display when the laptop's lid is closed, by relaying the information to the video card. In some cases, the switch may get stuck in a closed position preventing the LCD panel from displaying images even when the lid is open.