2. Content
Introduction
History
Features
Structure of OLED
OLED Fabrication
OLED Deposition
Working Principle
Types of OLED
OLED Advantages
OLED Disadvantages
Applications
Conclusion
References
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3. Introduction
OLEDs are solid state devices composed of thin films of
organic molecules that is 100 to 500 nanometres thick.
They emits light with the application of electricity. That’s
why they are called Organic Light Emitting Diode.
They doesn’t require any backlight. i.e. They are self
emitting.
They are made from carbon and hydrogen.
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4. History
The first OLED device was developed by Eastman
Kodak in 1987.
In 1996, pioneer produces the world’s first commercial
PMOLED.
In 2000, many companies like Motorola, LG etc
developed various displays.
In 2001, Sony developed world’s largest fullcolor OLED.
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5. Features
Flexibility.
Emissive Technology.
Light weight and thin.
Low power consumption.
High contrast, brighter and perfect display from all
angles.
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8. OLED Deposition
Organic layers can be applied to the substrate using
the following methods.
- Evaporation and shadow masking.
- Inkjet printing.
- Organic vapor phase deposition.
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10. Working Principle
A voltage is applied across the anode and cathode.
Current flows from cathode to anode through the organic
layers.
Electrons flow to emissive layer from the cathode.
Electrons are removed from conductive layer leaving holes.
Holes jump into emissive layer .
Electron and hole combine and light emitted.
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12. Types of OLED
Six types of OLEDs
Passive Matrix OLED(PMOLED).
Active Matrix OLED(AMOLED).
Transparent OLED(TOLED).
Top Emitting OLED.
Flexible OLED(FOLED).
White OLED(WOLED).
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13. OLED Advantages
Thinner, lighter and more flexible.
Do not require backlighting like LCDs.
Can be made to larger sizes.
Large fields of view, about 170 degrees.
Brighter.
High resolution, <5μm pixel size.
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16. Conclusion
Organic Light Emitting Diodes are evolving as the next
generation displays.
As OLED display technology matures, it will be better and
able to improve upon certain existing limitations of LCD
including
High power consumption.
Limited viewing angles.
Poor contrast ratios.
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