I'm not sure about typical, but I believe most high-end LED backlit displays use at least one of global or local dimming of the backlight depending on what's on

I'm not sure about typical, but I believe most high-end LED backlit displays use at least one of global or local dimming of the backlight depending on what's on the screen. This means that the power use of this type of LED backlit display is also sensitive to what is being displayed (but at a coarser resolution to OLED).