When shopping for a monitor, you might see the letters LCD and LED pop up over and over again. While both technically represent liquid crystal displays, they differ in terms of lighting source. LCDs or Liquid Crystal Displays utilises fluorescent lights behind the screen, while LEDs use Light-Emitting Diodes. Essentially, this means that LEDs can feature diodes behind the screen or around its edges. As a result, LED monitors are often thinner than LCDs, however, this trend is beginning to change.