OLED

Submitted To Submitted ByComputer Department Shubham Kanojia 1511 MCA -4th sem

What is an OLED ?

OLED – Organic Light Emitting Diode

A light-emitting diode containing thin flexible sheets of an organic electroluminescent material, used for visual displays.

Ching W. Tang and Steven Van Slyke reported the first OLED device .

Components 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.

Organic Layers : - These layers are made of organic molecules or polymers.

Conducting Layers : - This layer is made of organic plastic molecules that transport "holes" from the anode. One conducting polymer used in OLEDs is polyaniline.

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.

How OLEDS Work

Types of OLED

Passive OLEDS

The organic layer is between cathode & anode run perpendicular.

The intersections form the pixels.

Easy to make.

Use more power.

Best for small screens.

Active OLEDS

Full layers of cathode and anode.

Anode over lays a thin film transistor (TFT).

Requires less power.

Higher refresh rates.

Suitable for large screens.

Applications of OLED

• Televisions• SONY• LG transparent TV

• Cell Phone screens

• Wrist Watch• Computer Screens

• Laptops• Desktops

• Bendable Devices• Portable Device displays

• Philips Go Gear MP3 Player

Advantages 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

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

Conclusion

Easily Portable because it can be folded and keep it at anywhere. Currently, there is a lot of research and development going on in the

field of OLEDs and experts feel that these might lead to novel applications such as automotive dashboards, heads-up displays, home and office lighting and billboard-type displays in the future.

OLED devices can keep refreshing information at real time and videos can look more realistic in them. So we can also fancy thin and foldable OLED newspapers in the future, which keep refreshing news even as you read them!

References

www.howstuffworks.com/oledwww.oled-info.com/introductionwww.oled-info.comhttps://en.wikipedia.org/wiki/OLED

Thank You

Fast Response Time

OLED LED

Fast response time means full motion graphics can be displayed

Wide Viewing Angle

Wide viewing angle.