OLED Display (Organic Light-Emitting Diode)

OLED stands for 'Organic Light-Emitting Diode. It is also known as LEP or 'Light-Emitting Polymer' and OEL or 'Organic Electro-Luminescence'. Eastman Kodak scientists invented the technology in 1987.

An OLED display consists of thin films sandwiched between two charged electrodes (a cathode and a transparent anode). The sandwiched layers consist of a 'hole injection' layer, a 'hole transport' layer, an 'electron transport' layer and an 'emissive' layer. The emissive layer is an organic compound and emits light when electrically charged.

OLED displays are thinner, lighter, brighter, faster, provide increased viewing angles, use less power and are cheaper to manufacture compared to LCD display technology.

As the display is emitting light rather than modulating it no backlight is required and therefore power consumption is reduced. One downside to this is that it can be hard to see under a direct light source such as the sun.

Also see CSTN, STN, TFD and TFT.

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