seminar report on amoled technology

7/31/2019 Seminar Report on Amoled Technology

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AMOLED DISPLAY

Submitted by:

Ranjana upadhayay

Anjali singh


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CONTENT

Introduction History Components

Principle and Working Applications and future prospects Advantages

Disadvantages Conclusion


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INTRODUCTION

Active-Matrix OLED (Active-matrix organic light-

emitting diode or AMOLED) is a display technology .

AMOLED is type of OLED .

OLED describes specific type of thin displaytechnology and Active-Matrix refers to the technology

behind the addressing of pixels.

An OLED is any LED whose emissive

electroluminescent layer comprises a film of organic

compounds

The layer usually contains a polymer substance that

allows suitable organic compounds to be deposited.


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They are deposited in rows and columns onto a flatcarrier by a simple printing process.

The resulting matrix of pixels can emit light of differentcolors.


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HISTORY

The first EL from a an organic molecule, anthracene,was reported by Pope and coworkers in 1963 . Itsthickness was between 10m-5mm when a bias ofseveral hundred volts was applied across it.

P. S. Vincent achieved bright blue EL from vacuum-deposited 0.6m thick anthracene crystal films with anapplied bias of less than 100V.

The breakthrough was achieved by Tang and VanSlykein 1987, who made a bilayer structure by thermallyevaporating the small molecular weight organic

materials. In 1989, Tang developed a laser-dye doped Alq3

multilayer structure ,in which the fluorescent efficiencywas improved and the emission color varied from theoriginal green to the dopant emission color.


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M. A. Baldo fabricated and demonstrated

phosphorescent OLEDs , by doping phosphorescent

molecules, where the EL is due to triplet emission, into

a fluorescent host layer


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AMOLED COMPONENT

Cathode - The Top Layer is the

Cathode layer made of tungsten

releases electrons when current

is run through it.

Emissive layer - Itis layermade of organic plastic molecules

& removes electrons from the

cathode layer to make light.

Conducting layer - This layer ismade of organic plastic molecules

that transport "holes" from the anode.


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Anode -Anode Layer that consist of removing and

adding electron holes while the current is running

through it and is made from graphite particles

Substrate (clear plastic, glass) -The substrate supports

the OLED.

TFT-AMOLED Consist of TFT

beneath the anode that controls the

pixel display.


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PRINCIPLE

A typical AMOLED is composed of a layer of organic

materials situated between two electrodes, the anode

and cathode.

Organic material are semiconductor.

The highest occupied and lowest unoccupied molecular

orbital (HOMO and LUMO) of organic semiconductors

are analogous to the valence and conduction bands of

inorganic semiconductors.


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When anode is positive with respect to the cathode. A

current of electrons flows through the device from

cathode to anode, as electrons are injected into the

LUMO of the organic layer at the cathode andwithdrawn from the HOMO at the anode.


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WORKING


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ADDRESSING OF DISPLAY

(Active matrix)

Place transistorat each pixel

Selected pixel

will be on untiltransistor isrefreshed


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APPLICATIONS

Cellular/mobile phones

MP3 players

Digital cameras

Windows that light-up atdark

AMOLED TV

TABLET PC


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FUTURE PROSPECTS

Curved AMOLED

displays

Wearable AMOLEDs

Transparent AMOLEDsembedded in windows

AMOLEDs in car

windshields

Realizing Conceptmodels of various

mobile devices


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ADVANTAGES

Thinner ,lighter and flexible


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Higher contrast ratio andsun readability


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Large viewing angle


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Faster response


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Brightness

Less Power consumption


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DISADVANTAGES

LifetimeManufacturing

Susceptible to Water


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CONCLUSION

Limited use caused by degradation of materials.

OLED will replace current LED and LCDtechnologies

Expensive Flexibility and thinness will enable many

applications


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THANK YOU

seminar report on amoled technology

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