1.
Seminar
On
OLED
Submitted By:
Shivam Bansal
Department of Electronics and Communication Engineering
School of Engineering and Technology
H.N.B.Garhwal Central University ,Srinagar Garhwal
2018-19
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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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6.
Structure of OLED
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7.
OLED Fabrication
 Substrate preparation.
 Device deposition
 Encapsulation.
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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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9.
Colour Generation
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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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Working Principle
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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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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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14.
OLED Disadvantages
 Expensive.
 Lifespan.
 Water damage.
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15.
Applications
Major applications of OLED technology are:-
 OLED TV.
 Mobile phones with OLED screens.
 Rolltop Laptop.
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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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References
 www.google.com/oled_tech.php
 www.wikepedia.co/organic-electronics.aspx
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Thank You
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Any Queries
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