The document discusses OLED technology. It defines OLEDs as thin films of organic molecules that emit light when electric current is applied. The document outlines the structure of OLEDs including the substrate, anode, organic layers, and cathode. It also describes the working principle where electrons and holes combine in the emissive layer to produce light. Additionally, it covers the types of OLEDs and their applications in devices like TVs and mobile phones.

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Submitted By: Under Guidance of:
G. Rajashekar Ms. Farheen Sulthana
20C35A0411 Assistant Professor
ECE Department ECE Department
DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING
TECHNICAL SEMINAR
ON
OLED Technology

2. • Abstract
• Introduction
• What is an OLED
• Features
• Structure of OLED
• Working Principle
• Types of OLED
• Advantages
• Applications
• Conclusion
CONTENTS:
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OLED is a display device that sandwiches carbon based films of organic
molecules that is 100 to 500 nanometres thick between the two electrodes and
when voltage is applied creates light.
OLED doesn't require any backlight. i.e., they are self-emitting.
OLEDs are made from carbon and hydrogen.
As the OLEDs are made of organic compounds, they are called as Organic
Light Emitting Diode.
 OLEDs have dynamic power consumption when displaying different images.
The power consumption of the OLED panel is only dependent on the pixels that
are lit in the images.
Abstract

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INTRODUCTION
Uses organic light emitting diode(OLED).
 Emerging Technology for displays in devices.
Main principle behind OLED technology is electroluminescence.
 Offers brighter, thinner, high contrast, flexible displays.

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WHAT IS AN OLED?
OLEDs are solid state devices composed of thin films of
organic molecules that is 100 to 500 nano meters thick.
They emits light with the application of electricity.
 They doesn't require any backlight. i.e., they are self
emitting.
They are made from carbon and hydrogen.

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FEATURES
 Flexibility.
 Emissive Technology.
 Light weight and thin.
 Low power consumption.
 High contrast, brighter and perfect display from
all angles.

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SRUCTURE OF OLED
 Substrate.
 Anode.
 Organic layer.
-Conductive layer (Hole Transport Layer).
made up of polyaniline or metal-phthalocyanine. -
Emissive layer( Electron Transport Layer).
made up of polyfluorene or metal chelates.
 Cathode.

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SRRUCTURE OF OLED(FIGURE)

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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(FIGURE)

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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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1.Passive matrix OLED (PMOLED). 2.Active matrix OLED(AMOLED). 3.Transparent OLED(TOLED).
4.Top emitting OLED. 5.Flexible OLED(FOLED). 6.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.
 Faster response time.
 Brighter.
 High resolution, <5µm pixel size.

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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.
 High power consumption
 Limited viewing angles
 Poor contrast ratios.

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