This document discusses organic light emitting diodes (OLEDs). It provides background on OLEDs, explaining that they are thin films of organic materials sandwiched between two conductive layers that emit light when electric current is applied. OLEDs are self-luminous, efficient, thin, and flexible. They can be used for displays in devices like phones, laptops, TVs, and signs. The document outlines the working principles of OLEDs and their advantages over other display technologies like LCDs. However, it also notes some challenges with OLEDs related to color balance issues, water damage, and power consumption.