OLED

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1 What is OLED?
2 OLED vs. LCD
3 Active OLED
4 Passive OLED
5 External Links

What is OLED?

OLED Diagram

An OLED or Organic Light-Emitting Diode is a light emitting device based on the principle of electrophosphorescence. Several types of organic material that will glow red, green and blue are placed between two layers of conductive material and covered with glass or another translucent protective material. When electric current is applied, the conductive layers act as anode (positively charged) and cathode (negatively charged), enabling the flow of energy from the negative layer to the positive layer and stimulating the organic material to emit a bright light. The two most common types of OLED:

SMOLED or Small Molecular OLED: layers of organic material with very small molecular structures are assembled using vacuum vapor deposition
Poly-OLED or Polymer OLED: layers are prepared by spin coating a surface with large molecular structure organic polymers

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OLED vs. LCD

A non-organic LCD display does not emit light; a backlight sits behind the LCD panel and to create the image you see on screen, individual liquid crystals allow light to pass or block it. OLED computer displays do not require a backlight since the organic material self-generates light, so they require very little external power.

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