2. INTRODUCTION
Uses organic light emitting diode(OLED).
Emerging Technology for displays in devices.
Main principle behind OLED technology is
electroluminescence.
Offers brighter, thinner, high contrast, flexible
displays.
3. WHAT IS AN OLED?
OLEDs are solid state devices composed of thin
films of organic molecules that is100 to 500
nanometres thick.
They emits light with the application of electricity.
They doesn’t require any backlight. i.e., they are
self emitting.
They are made from carbon and hydrogen.
4. HISTORY
The first OLED device was developed by Eastman
Kodak in 1987.
In 1996, pioneer produces the world’s first
commercial PMOLED.
In 2000, many companies like Motorola, LG etc
developed various displays.
In 2001, Sony developed world’s largest fullcolor
OLED.
5. HISTORY (CONTD.)
In 2002, approximately 3.5 million passive matrix
OLED sub-displays were sold, and over 10 million
were sold in 2003.
In 2010 and 2011, many companies announced
AMOLED displays.
Many developments had take place in the year
2012.
6. FEATURES
Flexibility.
Emissive Technology.
Light weight and thin.
Low power consumption.
High contrast, brighter and perfect display from all
angles.
7. STRUCTURE OF OLED
Substrate.
Anode.
Organic layer.
-Conductive layer (Hole Transport Layer).
made up of polyaniline or metal-phthalocyanine.
-Emissive layer( Electron Transport Layer).
made up of polyfluorene or metal chelates.
Cathode.
9. OLED FABRICATION
Substrate preparation.
Device deposition
Deposit and pattern anode.
Pattern organic layers.
Vacuum deposit and pattern cathode.
Encapsulation.
Also involves making backplane.
10. OLED DEPOSITION
Organic layers can be applied to the substrate
using the following methods.
- Evaporation and shadow masking.
- Inkjet printing.
- Organic vapor phase deposition.
14. COLOUR GENERATION
Different approaches for fabricating red, green and
blue pixels.
- Red, green and blue individual pixels.
- White emitter and colour filters.
- Blue emitter and colour converters.
- Stacked OLED
16. WORKING PRINCIPLE
A voltage is applied across the anode and cathode.
Current flows from cathode to anode through the
organic layers.
Electrons flow to emissive layer from the cathode.
Electrons are removed from conductive layer
leaving holes.
Holes jump into emissive layer .
Electron and hole combine and light emitted.
19. TYPES OF OLED
Six types of OLEDs
Passive matrix OLED(PMOLED).
Active matrix OLED(AMOLED).
Transparent OLED(TOLED).
Top emitting OLED.
Flexible OLED(FOLED).
White OLED(WOLED).
26. OLED ADVANTAGES
Thinner, lighter and more flexible.
Do not require backlighting like LCDs.
Can be made to larger sizes.
Large fields of view, about 170 degrees.
Faster response time.
Brighter.
High resolution, <5μm pixel size.
33. CONCLUSION
Organic Light Emitting Diodes are evolving as the
next generation displays.
As OLED display technology matures, it will be
better able to improve upon certain existing
limitations of LCD including
high power consumption
limited viewing angles
poor contrast ratios.