2. LEP
It is a polymer that emits light when voltage is applied to
it.
The structure comprises of thin film semi conducting
polymer sandwiched between anode and cathode
3. Energy difference between the valence band and
conduction band of the semiconducting polymer
determines the wavelength, i.e., color of emitted
light
4. STRUCTURE AND WORKING
It’s display solely consists of the polymer
material manufactured on a substrate of glass or
plastic and doesn’t require additional polarizers
that are typical of LCDs
7. MANUFACTURING METHODS
1. Spin coating process:
In this a glass substrate is spinned at a fixed angular
velocity on which a plastic solution is poured.
2. Printer based Technique:
LEPs can be patterned using a wide variety of printing
techniques. The most advanced is ink jet printing with a
resolution as high as 360 DPI.
8. ADVANTAGES
Operates with 3.3volts only
As active material is plastic cost is much
less than CRT, LCD.
Greater power efficiency than all other flat
panel displays
Life time of more than 30,000 hours
Can be viewed at any angle
Fast switching speed i.e. 1000 times faster
than LCDs.
Higher luminescence efficiency
10. APPLICATIONS
Multi or full color cell phone display
HD Television display
Light weight wrist watches
Military applications
Aircraft cockpit instrumentation
11. CONCLUSION
LEP technology is now set to change the products
we use to view the world