20-08-2012, 05:11 PM
OLED(Organic Light Emitting Diode)
Organic LED .ppt (Size: 1.16 MB / Downloads: 33)
What is an OLED?
OLED - Organic Light Emitting Diode
An OLED is any light emitting diode (LED) in which emissive electroluminescent layer is composed of a film of organic compounds.
History of OLEDs
1960s - AC-driven electroluminescent cells using doped anthracene was developed
In a 1977 paper, Shirakawa et al. Reported high conductivity in similarly oxidized and iodine-doped polyacetylene.
In 1987 Chin Tang and Van Slyke introduced the first light emitting diodes from thin organic layers.
In 1990 electroluminescence in polymers was discovered.
Architecture of OLEDs
Organic layer:
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.
Advantages of OLEDs
Much faster response time
Consume significantly less energy
Able to display "True Black" picture
Wider viewing angles
Thinner display
Better contrast ratio
Safer for the environment
Has potential to be mass produced inexpensively
OLEDs refresh almost 1,000 times faster then LCDs
Disadvantages of OLEDs
OLED Displays Vs. LCD and Plasma
Cost to manufacture is high
Overall luminance degradation
Constraints with lifespan
Easily damaged by water
Limited market availability
Organic LED .ppt (Size: 1.16 MB / Downloads: 33)
What is an OLED?
OLED - Organic Light Emitting Diode
An OLED is any light emitting diode (LED) in which emissive electroluminescent layer is composed of a film of organic compounds.
History of OLEDs
1960s - AC-driven electroluminescent cells using doped anthracene was developed
In a 1977 paper, Shirakawa et al. Reported high conductivity in similarly oxidized and iodine-doped polyacetylene.
In 1987 Chin Tang and Van Slyke introduced the first light emitting diodes from thin organic layers.
In 1990 electroluminescence in polymers was discovered.
Architecture of OLEDs
Organic layer:
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.
Advantages of OLEDs
Much faster response time
Consume significantly less energy
Able to display "True Black" picture
Wider viewing angles
Thinner display
Better contrast ratio
Safer for the environment
Has potential to be mass produced inexpensively
OLEDs refresh almost 1,000 times faster then LCDs
Disadvantages of OLEDs
OLED Displays Vs. LCD and Plasma
Cost to manufacture is high
Overall luminance degradation
Constraints with lifespan
Easily damaged by water
Limited market availability