Backlight

Refers to the light unit in LCD displays which create the light to display the pictuThe backlight unit, or BLU, refers to the light unit in LCD display which creates the light to display the picture on the screen. Most LCD sets use LED backlights either arranged along one or more edges of the screen (edge lit), or directly behind the screen (direct lit). Control over these lights also affects how well the TV renders dimming and brightness on different sections (zones) of its display as you’re watching content.