oled flexible technology
TRANSCRIPT
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
• 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