OLED FLEXIBLE ELECTRONIC PAPER DISPLAY

Presented by: Praveen Sheri 4JE10EC424

VIII- Sem ECE

Under Guidence of:Prof. A Thyagaraja Murthy

Associate Professor

DEPARTMENT OF ELECTRONICS& COMMUNICATION ENGINEERINGSRI JAYACHAMARAJENDRA COLLEGE OF ENGINEERING

Mysore-57001

OLED - Organic Light Emitting Diode

An OLED is a light emitting diode (LED) which emissive electroluminescent layer is composed of a film of organic compounds.

What is an OLED ?

• First developed in the early 1950s in France.

• 1960s-AC-driven electroluminescent cells using doped anthracene was developed.

• In 1987 Chin Tang and Van Slyke introduced the first light emitting diodes from thin organic layers. 

• In1990 electroluminescence in polymers was discovered. 

HISTORY

SUBSTRATE.

ANODE

ORGANIC LAYER: 1-Conductive layer 2-Emmisive layer

CATHODE.

ARCHITECTURE OF OLED

• The organic layer is between cathode & anode run perpendicular.

• The intersections form the pixels.

• Easy to make.

• Use more power.

• Best for small screens.

DIFFERNT TYPES OF OLED

• Substrate (clear plastic, glass, foil) - The substrate supports the OLED. • Anode (transparent) - The anode removes electrons (adds electron "holes") when a current flows through the device.

Architecture of OLEDs

• Organic layer: o Conducting layer-This layer is ma-de of

organic plastic molecules that transport "holes" from the anode. One conducting polymer used in OLEDs is polyaniline.

o Emissive layer - This layer is made of organic plastic molecules (different ones from the conducting layer) that transport electrons from the cathode; this is where light is made. One polymer used in the emissive layer is polyfluorene.

 • Cathode (may or may not be transparent depending on the type of OLED) - The cathode

injects electrons when a current flows through the device.

• Televisions• SONY• LG transparent TV

• Cell Phone screens

• Wrist Watch• Computer Screens

• Laptops• Desktops

• Bendable Devices• Portable Device displays

• Philips Go Gear MP3 Player

APPLICATION OF OLED

• Faster response time than LCDs • Consume significantly less energy • Can be transparent when off• Flexible and Conformal Displays • Thinner display-No backlight required• Better contrast ratio• Safer for the environment• Wider viewing angles; up to 170 degrees• OLEDs refresh almost 1,000 times faster then LCDs• Low cost materials and fabrication method• Less Expensive than LCD due to lesser components• Can be made using plastic screens; LCDs require glass backing

ADVANTAGES

DISADVANTAGES

OLED seems to be the perfect technology for all types of displays, but it also has some problems:

• Lifetime - While red and green OLED films have longer lifetimes (46,000 to 230,000 hours), blue organics currently have much shorter lifetimes (up to around 14,000 hours)

• Manufacturing - Currently, manufacturing is more expensive than LCDs

• Water - Water can easily damage OLEDs• OLED screens are even worse than LCD in direct

sunlight• Overall luminance degradation• Limited market availability

Manufacturers focusing on finding a cheap way to produce.

"Roll-to-Roll" Manufacturing.

Increasing efficiency of blue luminance.

  Boosting overall lifespan

FUTURE USES FOR OLED

Data glass GPS system  OLED – in future cars Curved OLED displays, placed on non-flat surfaces And many more we cannot even imagine today

Scroll Laptop• Nokia concept OLED Laptop

FUTURE USES FOR OLED

REFERENCES  Lahey, Byron, et al. "PaperPhone: understanding the use of bend

gestures in mobile devices with flexible electronic paper displays", Proceedings of the SIGCHI Conference on Human Factors in Computing Systems. ACM, pp 1303-1312, 2011

Warren, Kristen, et al. "Bending the rules: bend gesture classification for flexible displays."

Proceedings of the SIGCHI Conference on Human Factors in Computing Systems. ACM, PP

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