Brief introduction of OLED

1. U.NIKHILESH – 18JN1A0419
C.RAJESH – 18JN1A0420

2. OLED
ORGANIC LIGHT
EMITTING DISPLAY

3. 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

4. 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.

5. 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.

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(Figure)

8. OLED Fabrication
• Substrate preparation.
• Device deposition
• Deposit and pattern anode.
• Pattern organic layers.
• Vacuum deposit and pattern cathode.
• Encapsulation.
• Also involves making backplane.

9. OLED Deposition
• Organic layers can be applied to the
substrate using the following methods.
- Evaporation and shadow masking.
- Inkjet printing.
- Organic vapor phase deposition.

10. 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

11. Colour Generation(figure)

12. 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.

13. Working Principle(figure)

14. Types of OLED
Passive matrix OLED(PMOLED).
Active matrix OLED(AMOLED).
Transparent OLED(TOLED).
Top emitting OLED.
Flexible OLED(FOLED).
White OLED(WOLED).

15. 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.

16. OLED Disadvantages
• Expensive.
• Lifespan.
• Water damage.
• Colour balance issues .

17. References
• www.google.com
• www.wikipedia.com
• https://www.oled-info.com/
• www.pptplanet.com

18. 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

19. THANK
YOU……