This document summarizes a seminar presentation on organic light-emitting diodes (OLEDs). It discusses the history and development of OLEDs from their invention in 1987. The key features of OLEDs are described, including their flexibility, emissive technology, light weight, thinness, and low power consumption. The document outlines the structure, fabrication, deposition methods, working principle, types, advantages, and applications of OLEDs. It concludes that OLED display technology has the potential to improve upon limitations of LCD such as high power consumption and limited viewing angles.

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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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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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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11. 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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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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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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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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17. References
 www.google.com/oled_tech.php
 www.wikepedia.co/organic-electronics.aspx
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18. Thank You
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19. Any Queries
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