OLED_AVEpptforaudiovideoengineering.pptx

audiovideo

1. O L E D Semester V Electronics & communication Engineering Prepared by:- Dharmik Shah(EC074) Raj Joshi(EC086) ORGANIC LIGHT EMMITING DIODE

2. Content What is an OLED? How is it made? How do OLEDs emit light? Types of OLEDs Advantages and Disadvantage Future Of OLEDs Conclusion

3. INTRODUCTION

4. These all devices may be possible in the near future with the help of a technology called O rganic L ight- E mitting D iodes.

5. What is an OLED? An OLED is any light emitting diode in which organic layers are responsible for light emission.

6. The Basic Principal Electroluminescence is a process in which a material emits light in response to electrical field applied across it.

7. Cathode   - The cathode injects electrons into emissive layer. Emissive layer  - This layer is made of polyfluorene that transport electrons from the cathode. This is where light is made. Conducting layer  - This layer is made of polyaniline that transport "holes" from the anode. Anode  – It is kept transparent. Usually made up of Indium tin oxide (ITO) that removes electrons. Substrate - The substrate supports the OLED.

8. How do OLEDs Emit Light?

9. How it works?

10. Types of OLEDs Passive-matrix OLED Active-matrix OLED Transparent OLED Top-emitting OLED Foldable OLED White OLED

11. Passive Matrix The organic layers are between strips of cathode and anode. The intersections form the pixels. Easy to make Uses more power

12. Active-matrix OLED Full layers of cathode and anode. Anode overlays a thin film transistor ( TFT ). Requires less power Higher refresh rates

13. Transparent OLEDs Transparent OLEDs have only transparent components (substrate, cathode and anode) When turned off, are up to 85 percent as transparent as their substrate.

14. Top emitting OLEDs Top-emitting OLEDs have a substrate that is reflective. Foldable OLED Foldable OLEDs have substrates made of very flexible metallic foils or plastics.

15. White OLED White OLEDs emit white light that is brighter, more uniform and more energy efficient.

16. Why it’s so great? Less power consumption Lower cost in the future Flexible Display Thin display Safer for environment

17. Better contrast ratio

18. Wider Viewing Angle

19. Major Drawbacks Lifespan Easily damageable Outdoor performance Complex fabrication methods

20. OLED VS OTHERS

21. Future Aspects Finding a cheap way to produce “Roll-To-Roll” Manufacturing Increasing efficiency of blue OLED Increasing Lifespan of OLED

22. Corporation in OLED’s

23. Conclusion

24. REFERENCES http://electronics.howstuffworks.com/oled.html http://www.tridonic.com/ae/img/OLEDmodule_LUREON_REP.jpg http://cdn1.bigcommerce.com/server4300/905b4/product_images/uploaded_images/how-do-leds-work.jpg http://s.hswstatic.com/gif/oled-top-emitting.gif http://www.homeinfo.hu/images/stories/kivitelezes/villamossag/OLED_5.jpg http://www.maximumpc.com/files/u90693/anatomy-full.jpg

25. Thank You