Which is a circuit board located behind an LCD screen on a laptop?

Digitizer

Inverter

OLED panel

System board

Inverter is located behind the LCD screen on a laptop.

Explanation:

Inverter is a circuit board that is used to control the voltage according to the requirement of laptop display. It convert the DC voltage into AC voltage and limit the power that is required to florescent lamps used inside the liquid crystal display to glow it with better performance. As DC supply is provided to all the components in laptop. LCD use AC supply that is why, Inverter is used behind the LCD to provide it AC supply.