A SEMINAR

PRESENTATION ON

AMOLED(Active matrix organic light emitting diode)

Presented To:-

Prof. aswathhi puthhukulam

Presented By:-

JITENDRA KUMARROLL NO.-12EJIEC045SECTION –C(C3)

1

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

2

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

3

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.

The active matrix technology is invented by Bernard Lechner in 1975

4

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

5

AMOLED COMPONENT :

CathodeEmissive layer Conducting layerAnodeSubstrateTFT

6

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

7Working

Working: 8

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

9

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: 10

Comparison between AMOLED and TFT Display

Figure 2 – TFT Display

AMOLED has less complexity so is much thinner

11

Figure 1 - AMOLED

APPLICATIONS

Cellular/mobile phonesMP3 playersDigital cameraAMOLED TVTABLET / PC

12

Some of the Present Gadgets 13

ADVANTAGES1. Thinner ,lighter and flexible

14

AMOLED LCD TFT

<50uS3000~30000uS

Fast response time means full motion graphics can be displayed

152. FAST Response Time

AMOLED TFT 163. High Contrast Ratio

4. Less Power Consumption:-AMOLED power consumption depends on image content & application.

5. Large viewing angle

6. Brightness

DISADVANTAGES

•Limited Lifetime•Expensive manufacturing process•Easily damaged by Water•Fabrication of substrate is complex

17

FUTURE PROSPECTS

Curved AMOLED displays

Wearable AMOLEDs

Transparent AMOLEDs embedded in windows

AMOLEDs in car windshields

Realizing Concept models of various mobile devices

18

19FUTURE USE OF AMOLED

CONCLUSION

Limited use caused by degradation of materials.

AMOLED will replace current LED and LCD technologies

Flexibility and thinness will enable many applications

20

THANK YOU 21

Thank You