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Sumit oled

  1. O.L.E.DO.L.E.D (Organic(Organic LightLight EmittingEmitting Diode)Diode) SUMIT SHRESTHASUMIT SHRESTHA 1/12/FET/BIT/2/0121/12/FET/BIT/2/012 6ITB6ITB Presented by:Presented by: 1
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  3. DEPT OF ECE, CBIT, KOLAR 3 INTRODUCTION  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 ?What is an OLED ? OLED - Organic Light Emitting Diode  An OLED is a light emitting diode (LED) which emissive electroluminescent layer is composed of a film of organic compounds.  OLEDs are solid state devices composed of thin films of organic molecules that is 100 to 500 nanometres thick  They doesn’t require any backlight. i.e., they are self emitting 4
  5. • Electroluminescence (EL) is an optical  phenomenon and electrical phenomenon in  which a material emits light in response to  an electric current passed through it, or to a  strong electric field 5
  6. DEPT OF ECE, CBIT, KOLAR 6 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 full colour OLED
  7. DEPT OF ECE, CBIT, KOLAR 7 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 And Still Counting….
  9. How OLEDs Emit LightHow OLEDs Emit Light • The battery or power supply of the device containing the OLED applies a voltage across the OLED. • An electrical current flows from the cathode to the anode through the organic layers. (an electrical current is a flow of electrons) • At the boundary between the emissive and the conductive layers, electrons find electron holes. • The OLED emits light.
  10. Types of OLEDsTypes of OLEDs • Passive-matrix • Active-matrix • Transparent • Top-emitting • Flexible • White 10
  11. DEPT OF ECE, CBIT, KOLAR 11 1. Passive-Matrix OLED (PMOLED) • Perpendicular cathode/anode strip orientation • Light emitted at intersection (pixels) • External circuitry – Turns on/off pixels • Large power consumption – Used on 1-3 inch screens – Alphanumeric displays
  12. 12 • 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 2. Active-Matrix OLED (AMOLED)
  13. 13 3. Transparent OLED(TOLED) • Transparent substrate, cathode and anode • Bi-direction light emission • Passive or Active Matrix OLED • Useful for heads-up display – Transparent projector screen – Glasses
  14. DEPT OF ECE, CBIT, KOLAR 4. Top-emitting OLED(TEOLED) • Non-transparent or reflective substrate • Transparent Cathode • Used with Active Matrix Device • Smart card displays 14
  15. 15 5. Foldable OLED • Flexible metallic foil or plastic substrate • Lightweight and durable • Reduce display breaking • Clothing OLED
  16. DEPT OF ECE, CBIT, KOLAR 6. White OLED • Emits bright white light • Replace fluorescent lights • Reduce energy cost for lighting • True Color Qualities 16
  17. DEPT OF ECE, CBIT, KOLAR FEATURES  Flexibility.  Emissive Technology.  Light weight and thin.  Low power consumption.  High contrast, brighter and perfect display from all angles. 17
  18. APPLICATION OF OLEDAPPLICATION OF OLED • Televisions • SONY • LG transparent TV • Cell Phone screens • Wrist Watch • Computer Screens • Laptops • Desktops • Bendable Devices • Portable Device displays • Philips Go Gear MP3 Player 18
  19. BENDABLE OLED DISPLAYBENDABLE OLED DISPLAY Organic Light Emitting Diode (OLED) technology is threatening the Liquid Crystal Display, or LCD, standard because of its flexibility, low power consumption and versatility. 19
  20. OLED DATA GLASSOLED DATA GLASS Developed by Students at the Fraunhofer Institute in Germany A pair of interactive data eyeglasses that can project an image onto the retina from an organic light-emitting diode (OLED) micro- display, making the image appear as if it's a meter in front of the wearer. Similar headwear only throws up a static image, Just the movement of the eyeball, to scroll through information. 20
  21. •The power consumption of the OLED panel is only dependent on the pixels that are lit in the images. •OLEDs have dynamic power consumption when displaying different images. •LCD with backlights consumes essentially constant power disregarding the images that are displayed. 21
  22. ADVANTAGESADVANTAGES • Faster response time than LCDs • Consume significantly less energy • Can be transparent when off • Flexible and Conformal Displays • Thinner display-No backlight required • Better contrast ratio • Safer for the environment • Wider viewing angles; up to 170 degrees • OLEDs refresh almost 1,000 times faster then LCDs • Low cost materials and fabrication method • Less Expensive than LCD due to lesser components • Can be made using plastic screens; LCDs require glass backing 22
  24. FAST RESPONSE TIMEFAST RESPONSE TIME OLED LCD Fast response time means full motion graphics can beFast response time means full motion graphics can be displayeddisplayed 24
  25. Current OLEDsCurrent OLEDs
  26. Future of OLEDs?Future of OLEDs?
  27. ROLL TO ROLL PRINTINGROLL TO ROLL PRINTING •The flexible OLED element capable of being produced using roll-to-roll printing technology. •The ROLLED project under European researchers coordinated by VTT. 27
  28. FUTURE USES FOR OLEDFUTURE USES FOR OLED  Manufacturers focusing on finding a cheap way to produce.  "Roll-to-Roll" Manufacturing.  Increasing efficiency of blue luminance.  Boosting overall lifespan 28
  29. FUTURE USES FOR OLEDFUTURE USES FOR OLED  Data glass  GPS system  OLED – in future cars  Curved OLED displays, placed on non-flat surfaces  And many more we cannot even imagine today Scroll Laptop • Nokia concept OLED Laptop 29
  30. CHALLENGESCHALLENGES OLED seems to be the perfect technology for all types of displays, but it also has some problems: • Lifetime - While red and green OLED films have longer lifetimes (46,000 to 230,000 hours), blue organics currently have much shorter lifetimes (up to around 14,000 hours) • Manufacturing - Currently, manufacturing is more expensive than LCDs • Water - Water can easily damage OLEDs • OLED screens are even worse than LCD in direct sunlight • Overall luminance degradation • Limited market availability 30