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OLED Devices and Applications

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  1. OLED Devices and Applications By Sarkis Arabyan 23449826 12/4/08

  2. Outline • Motivation • How OLED works • Types of OLEDs • Advantages and Challenges • Current and Future Applications

  3. Motivation 41 in Samsung Prototype

  4. How OLED Works • Cathode • Emissive Layer • Conductive Layer • Anode • Substrate

  5. How OLED Works • Voltage applied across Cathode and Anode • Typically 2V-10V • Current flows from cathode to anode • Electrons flow to emissive layer • Electrons removed from conductive layer leaving holes • Holes jump into emissive layer • Electron and hole combine and light emitted

  6. How OLED Works • Different Colors • type of organic molecule in the emissive layer • 3 molecules used -RGB • Intensity/brightness • amount of current

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

  8. 1. Passive-Matrix OLED (PMOLED) • Perpendicular cathode/anode strip orientation • Light emitted at intersection (pixels) • External circuitry • Turns on/off pixels • External circuitry • Large power consumption • Used on 1-3 inch screens • Alphanumeric displays

  9. 2. Active-Matrix OLED (AMOLED) • Full layers of cathode, anode, organic molecules • Thin Film Transistor matrix (TFT) on top of anode • Internal circuitry to determine which pixels to turn on/off • Less power consumed then PMOLED • Used for larger displays

  10. 3. Transparent OLEDTOLED • Transparent substrate, cathode and anode • Bi-direction light emission • Passive or Active Matrix OLED • Useful for heads-up display • Transparent projector screen • glasses

  11. 4. Top-emitting OLEDTEOLED • Non-transparent or reflective substrate • Transparent Cathode • Used with Active Matrix Device • Smart card displays

  12. 5. Foldable OLED • Flexable metalic foil or plastic substrate • Lightweight and durable • Reduce display breaking • Clothing OLED

  13. 6. White OLED • Emits bright white light • Replace fluorescent lights • Reduce energy cost for lighting • True Color Qualities

  14. 6. White OLED Cellphone backlight white OLED vs standard LED from Organic Lighting Technologies LLC

  15. OLED Advantages over LED and LCD • Thinner, lighter and more flexible • Plastic substrates rather then glass • High resolution (<5um pixel size) and fast switching (1-10um) • Do not require backlight, light generated • Low voltage, low power and emissive source • Robust Design (Plastic Substrate) • Larger sized displays • Brighter- good daylight visibility • Larger viewing angles -170o

  16. OLED Disadvantages • Lifetime • White, Red, Green  46,000-230,000 hours • About 5-25 years • Blue  14,000 hours • About 1.6 years • Expensive • Susceptible to water • Overcome multi-billion dollar LCD market

  17. Applications Kodak LS633 EasyShare with OLED display The Sony 11-inch XEL-1 OLED TV • Samsung Roadmap • 2009 - 14,15, and 21 inch OLED panel • 2010 - 40 to 42 inch full HD OLED panel • Toshiba Roadmap • 2009 – 30 inch Full HD panel

  18. Applications From OLED Technology Roadmap

  19. Applications A 2'x2' white light prototype by GE World’s First OLED Lamp

  20. Applications http://www.oled-info.com/buy-oled

  21. Conclusions • Limited use caused by degradation of materials. • OLED will replace current LED and LCD technologies • Expensive • Flexibility and thinness will enable many applications

  22. Work Cited • Bardsley, James. "International OLED Technology Roadmap." IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS. Jan. 2004. IEEE. <http://ieeexplore.ieee.org/stamp/stamp.jsp? arnumber=01288066>. • Freudenrich, Craig, Ph.D. "How OLEDs Work." Howstuffworks. 2008. <http://electronics.howstuffworks.com/oled.htm>. • OLED-info. "OLED Lights and Sony OLEDs." OLED displays and television resources, info and news. 2008. <http://www.oled-info.com/>. • Organic Lighting Technologies. "Technology." Organic Lighting Technologies LLC. 2006. <http://www.o- lite.com/technology.htm>.

  23. Q&A Thank You!