Uses organic light emitting diode(OLED).
Emerging Technology for displays in devices.
Main principle behind OLED technology is
Offers brighter, thinner, high contrast, flexible
WHAT IS AN OLED?
OLEDs are solid state devices composed of thin
films of organic molecules that is100 to 500
They emits light with the application of electricity.
They doesn’t require any backlight. i.e., they are
They are made from carbon and hydrogen.
The first OLED device was developed by Eastman
Kodak in 1987.
In 1996, pioneer produces the world’s first
In 2000, many companies like Motorola, LG etc
developed various displays.
In 2001, Sony developed world’s largest fullcolor
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
Many developments had take place in the year
Light weight and thin.
Low power consumption.
High contrast, brighter and perfect display from all
STRUCTURE OF OLED
-Conductive layer (Hole Transport Layer).
made up of polyaniline or metal-phthalocyanine.
-Emissive layer( Electron Transport Layer).
made up of polyfluorene or metal chelates.
Different approaches for fabricating red, green and
- Red, green and blue individual pixels.
- White emitter and colour filters.
- Blue emitter and colour converters.
- Stacked OLED
A voltage is applied across the anode and cathode.
Current flows from cathode to anode through the
Electrons flow to emissive layer from the cathode.
Electrons are removed from conductive layer
Holes jump into emissive layer .
Electron and hole combine and light emitted.
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.
High resolution, <5μm pixel size.
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.