LED Backlighting Techniques

RGB Dynamic LEDs
This method of backlighting allows dimming to occur locally creating specific areas of darkness on the screen. This can show truer blacks and much higher dynamic contrast ratios, at the cost of less detail in small bright objects on a dark background, such as star fields.[3]

Edge-LEDs
This method of backlighting allows for LED-backlit TVs to become extremely thin. The light is diffused across the screen by a special panel which produces a uniform color range across the screen.

Sharp also has LED backlighting technology that aligns the LEDs on back of the TV like the RGB Dynamic LED backlight, but it lacks the local dimming of other sets