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What is OLED TV?

OLED stands for Organic Light Emitting Diode. Light is emitted based on the principle of electrophosphorescence.

OLED TV's delivery an image to the screen in a very different way to that of an LCD or LED TV. LCD and LED TV's use a backlight which passes through a matrix of small 'shutters' that allow a certain amount of red, green or blue light through to produce the different colours.

In OLED TV's, 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.

An OLED consists of the following parts:

  • Substrate (clear plastic, glass, foil) - The substrate supports the OLED.
  • Anode (transparent) - The anode removes electrons (adds electron "holes") when a current flows through the device.
  • Organic layers - These layers are made of organic molecules or polymers.
    • Conducting layer - This layer is made of organic plastic molecules that transport "holes" from the anode. One conducting polymer used in OLEDs is polyaniline.
    • Emissive layer - This layer is made of organic plastic molecules (different ones from the conducting layer) that transport electrons from the cathode; this is where light is made. One polymer used in the emissive layer is polyfluorene.
  • Cathode (may or may not be transparent depending on the type of OLED) - The cathode injects electrons when a current flows through the device.

OLEDs have a massive advantage over LCD and normal LED screens as the produce their own light rather than relying on a backlight creating far better contrast ratios, improved black levels as well as using far less power to do so. OLEDs allow for the screens to become extremly thing improving aesthetics.