BY

M.S.KOUSHIK

ECE, GITAM HYD.

INTRODUCTION

• Light Emitting Polymer(LEP) is also called as

Organic Light Emitting Diode(OLED).• Different stages in display technology:

•

What is an OLED?• It is a polymer that emits light when voltage is

applied to it. • Polymers with metallic and semiconductor

characteristics are used in LEPs• Band gap of that material is 2.2 to 2.8 ev

Structure of an OLED

How LEPs Emit Light

Manufacturing

LEPs are manufactured in 2 ways.

1) Spin coating method :

2.Ink Jet Printing

Types of LEP’s based on matrix displays1)Active matrix OLED

2)Passive matrix OLED

Other types of LEP

Flexible Transparent Stacked

Top emitting OLED White OLED

Applications

• Cell phones • LEP TVs• Computer screens• Lights• Aircraft cockpit instrumentation• Photo voltaics

Advantages

• Low cost• Low power consumption• No viewing angle dependence• Better power efficiency• Less response time• Slimmer• Good for eyes• Self luminous• durability

Disadvantages

• Life span• Efficiency of blue OLEDs• Water damage• UV sensitivity

Conclusion

• OLEDs offer many advantages over both LEDs and LCDs.

• They are thinner, lighter and more flexible than the crystalline layers in an LED or LCD.

• They have large fields of view as they produce their own light.

• LEP technology is now set to change the products we use to view the world

References

• http://en.wikipedia.org/wiki/OLED• www.cdtltd.co.uk • www.research.philips.com • www.covion.com• www.lep-light.com• http://optics.org/cws/article/industry/37032  • http://www.oled-research.com/oleds/oleds-

history.html • http://www.technologyreview.com/energy/

21116• IEEE JOURNAL

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