First, you need to know what does LED stand for in general. The acronym means Light-Emitting Diodes. TVs that use LED as backlight have a giant light shutter behind the screen. It dims and illuminates the TV’s pixels based on the action taking place on your screen. LED displays produce deeper blacks and a more saturated color. That's because they have a greater optical range and are more power-efficient than fluorescents. In 2005, Sony produced the first LED TVs. In the near future, we should see MicroLED TVs. Their displays consist of microscopic LEDs forming the individual pixels.