Oled (organic led)

4,227 views

Published on

enjoy :)

Published in: Technology, Business
0 Comments
4 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
4,227
On SlideShare
0
From Embeds
0
Number of Embeds
5
Actions
Shares
0
Downloads
428
Comments
0
Likes
4
Embeds 0
No embeds

No notes for slide

Oled (organic led)

  1. 1. OLED TECHNOLOGY Saurabh Jain ECE- B 13620802810 Class No.- 94
  2. 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. 3. WHAT IS AN OLED?  OLEDs are solid state devices composed of thin films of organic molecules that is 100 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. 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. 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. 6. FEATURES   Flexibility. Emissive Technology.  Light weight and thin.  Low power consumption.  High contrast, brighter and perfect display from all angles.
  7. 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.
  8. 8. STRUCTURE OF OLED(FIGURE)
  9. 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. 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.
  11. 11. EVAPORATION AND SHADOW MASKING
  12. 12. INKJET PRINTING
  13. 13. 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.
  14. 14. WORKING PRINCIPLE(FIGURE)
  15. 15. OLED DEVICE OPERATION Transparent substrate Anode (ITO) Conductive layer Emissive layer eˉ LUMO eˉ LUMO Light HOMO HOMO h+ Cathode h+ h+
  16. 16. 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).
  17. 17. PASSIVE MATRIX OLED
  18. 18. ACTIVE MATRIX OLED
  19. 19. TRANSPARENT OLED
  20. 20. TOP EMITTING OLED
  21. 21. FLEXIBLE OLED
  22. 22. OLED ADVANTAGES  Thinner,  Do lighter and more flexible. 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.
  23. 23. OLED DISADVANTAGES  Expensive.  Lifespan.  Water damage.  Colour balance issues .
  24. 24. OLED VS. LCD OLED Greater view angle.  High contrast.  Faster response time.  Do not require backlighting.  Temperature(~50°C – 80°C).  LCD Limited view angle.  Low contrast.  Slow response time.  Require backlighting.  Temperature(~0°C100°C). 
  25. 25. APPLICATIONS Major applications of OLED technology are  OLED TV.  Mobile phones with OLED screens.  Rolltop Laptop.
  26. 26. OLED TV
  27. 27. MOBILE PHONES WITH OLED SCREEN
  28. 28. ROLLTOP LAPTOP
  29. 29. 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.
  30. 30. Thank You Saurabh Jain BPIT

×