AMOLED DISPLAY

Presented by:

Shubham Mundada

CONTENT

Introduction History Principle AMOLED Components Working Manufacturing of AMOLED Comparison Applications and future prospects Advantages Disadvantages Conclusion

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 display

technology 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.

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

The resulting matrix of pixels can emit light of different colors.

AMOLEDs have full layers of cathode, organic molecules and anode, but the anode layer overlays a thin film transistor (TFT) array that forms a matrix. The TFT array itself is the circuitry that determines which pixels get turned on to form an image.

AMOLEDs consume less power than PMOLEDs because the TFT array requires less power than external circuitry, so they are efficient for large displays. AMOLEDs also have faster refresh rates suitable for video. The best uses for AMOLEDs are computer monitors, large-screen TVs and electronic signs or billboards.

HISTORY The first EL from a an organic molecule, anthracene,

was reported by Pope and coworkers in 1963 .

The active matrix technology is invented by Bernard Lechner in 1975

PRINCIPLE

Electroluminescence (EL) is an optical phenomenon and electrical phenomenon in which a material emits light in response to an electric current passed through it, or to a strong electric field

AMOLED COMPONENT :

CathodeEmissive layer Conducting layerAnodeSubstrateTFT

Working:

The AMOLED display consists of a matrix of OLED pixels, each having an anode, cathode and a layer of organic material between them.

These pixels are activated by a thin film transistor array which controls the current to each pixel, enabling it to be activated and when current flows through it, light is generated.

Typically two transistors are used for each pixel - one to turn the charge to the pixel on and off, and a second to provide the constant current.

This eliminates the need for the very high currents required for passive matrix OLED operation

Manufacturing Of AMOLED

The biggest part of manufacturing AMOLEDs is applying the organic layers to the substrate. This can be done in three ways:

Vacuum deposition or vacuum thermal evaporation (VTE)

Organic vapor phase deposition (OVPD)

Inkjet printing

AMOLED LCD PLASMA

• Potentially the lowest cost. • Medium cost. • Highest cost

• Consumes lowest power • Lower Power consumption than plasma

• Highest power consumption

• Self emissive. • Requires backlight. • Requires backlight.

• Displays wider color range. • Color range not good. • Displays a very deep black.

• No screen burn potential • No screen burn potential • Screen burn potential

• Shorter overall lifetime • Backlight bulb typically requires replace at around 30 k hours

• Half life ~60k hours

Comparison:

APPLICATIONS

Cellular/mobile phones

MP3 players

Digital camera

AMOLED TV

TABLET PC

Some of the Present Gadgets

FUTURE PROSPECTS

Curved AMOLED displays

Wearable AMOLEDs

Transparent AMOLEDs embedded in windows

AMOLEDs in car windshields

Realizing Concept models of various mobile devices

ADVANTAGES

Thinner ,lighter and flexible

Higher contrast ratio and sun readability

Large viewing angle

Brightness

Less Power consumption

Faster response

DISADVANTAGES

•Lifetime•Efficiency of Blue OLED•Susceptible to Water

CONCLUSION

Limited use caused by degradation of materials.

AMOLED will replace current LED and LCD technologies

Flexibility and thinness will enable many applications

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