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O L E D O RGANIC L IGHT E MITtIng D IODE Display Technology

O L E D O RGANIC L IGHT E MITtIng D IODE Display Technology. Jay Dhamsaniya Rakesh Adroja Department of E & C Engineering Institute of Technology Nirma University Ahemedabad OCT - 2011. INTRODUCTION. Definition :

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O L E D O RGANIC L IGHT E MITtIng D IODE Display Technology

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  1. OLEDORGANIC LIGHT EMITtIng DIODEDisplay Technology Jay Dhamsaniya Rakesh Adroja Department of E & C Engineering Institute of Technology Nirma University Ahemedabad OCT - 2011

  2. INTRODUCTION • Definition : An organic light emitting diode (OLED) is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compounds that emits light when an electric current passes through it.

  3. working • 2 – layer structure • Active & In-active condition • Material used in layer • Anode (+)  Indium tin oxide (ITO) • Cathode (-)  Metals such as aluminium (Al) and calcium (Ca) • Emissive layer  Alq3 which emits radiation in the range of green light • Conductive layer  Diamine

  4. working • For efficient emission  recombination zone should be in the middle of the organic emissive layer • In organic semiconductors, holes are more mobile than electrons • Recombination happens closer to the emissive layer • Problem solution : Multi layer structured OLED

  5. Multi-layer oled • Electron-hole recombination zone is shifted in the middle of the emissive layer

  6. Types of oled

  7. Types of oled [A]Classification according to Organic Material used • SMALL MOLECULE OLEDs: • First developed at Eastman Kodak by Dr. Ching W. Tang • Example: Alq3 2. POLYMER MOLECULE OLEDs: • Example: poly(p-phenylenevinylene) 3. PHOSPHORESCENT MATERIALS OLEDs: • Example: Ir(mppy)3, • It is a phosphorescent dopant which emits green light

  8. Types of oled [B] Classification according to Transparency • Bottom or top emissive OLEDs: • One of the electrode is kept transparent

  9. Types of oled [B] Classification according to Transparency • Transparent OLEDs: • Both electrodes are kept transparent

  10. Types of oled [C]FOLDABLE OLED • Flexible substrate is used • It is prepared by roll-to-roll patterning method

  11. Types of oled [C]FOLDABLE OLED • FOLEDs offer Revolutionary Features for Display: • Flexibility • Ultra-lightweight, thin form • Durability • Cost-effective processing

  12. Types of oled [D]CLASSIFICATION ACCORDING TO PIXEL FORMATION USED • Active Matrix OLEDs (AM-OLEDs): • Display is a set of pixel • Pixel is a single oled • Individual Cathode and Anode • Biasing current provided to pixel, is controlled by TFT according to information • A/D: Reduces power consumption • D/A: Patterning/Fabrication cost is high

  13. Types of oled [D]CLASSIFICATION ACCORDING TO PIXEL FORMATION USED 2. Passive Matrix OLEDs (PM-OLEDs): • Cathode and Anode are kept common for each rows/columns • Pixel formed at the intersection

  14. Advantages of oled display • Advantages: • Very thin panel of approximately 1mm • Low power consumption • High brightness • High contrast ratio of 10,000 : 1 • Wide viewing angle of 170 • No environmental drawbacks • Foldable display panel

  15. Advantages of oled display • Advantages of OLED Display over TFT-LCD Display: 1. Contrast Ratio • Higher contrast ratio than TFT-LCD display • Better impression for higher brightness

  16. Advantages of oled display • Viewing Angle • Higher viewing angle up to 170 for constant contrast ratio • Graph: contrast V/S viewing angle

  17. Advantages of oled display 3. Response Time • Fast time response in order of <50 us • Comparison by graphical point of view

  18. Advantages of oled display 4. Backlight Function • No backlight required in OLED display • During black background OLED is turned OFF • In LCD backlight is still required

  19. Advantages of oled display 4. Power Efficiency • OLED display is more power efficient than TFT-LCD display • For the same power OLED display is more brighter

  20. disadvantages of oled display • Limited life time • Color balancing issues • Water damage • Power consumption

  21. Applications of oled display

  22. Future of Oled • Light weight • Thin • Unbreakable • Low cost processing potential for Roll-to-Roll patterning • New product possibility

  23. conclusion There are many other opportunities for application of organic thin-film semiconductors and challenges are remain for development that is shown following table.

  24. Thank you!

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