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Display Systems and photosensors (Part 3)

Display Systems and photosensors (Part 3). LCD TFT LED-OLED CCD CMOS. Introduction to: . OLED. and PLED. Mehdi.SHarif. History.

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Display Systems and photosensors (Part 3)

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  1. Display Systems and photosensors (Part 3) LCD TFT LED-OLED CCD CMOS

  2. Introduction to: OLED and PLED Mehdi.SHarif

  3. History • Organic light-emitting diodes (OLEDs) have made great progress since the first presentation of thin film devices based on small molecule organic materials by Tang and VanSlyke in 1987. • The OLED performance and stability have been rapidly increased over the last years. • Also, the size of the devices is growing and several applications like displays and general lighting are produced. • The developments for lighting applications will reach high efficiencies and low cost production to replace fluorescent and phosphorescent lamps. • Because of very thin active layers (several 10–100 nm), the low material amount used for the production of OLED results in cheap and lightweight products

  4. What is OLED? • An organic light emitting diode(OLED) is a light emitting diode • In OLED the emissive electroluminescent layer is a film of organic compounds . • There are two main families of OLEDs: those based upon small molecules and those employingpolymers. • Adding mobile ions to an OLED creates a Light-emitting Electrochemical Cell or LEC, which has a slightly different mode of operation. • An OLED display functions without a backlight. Thus, it can display deep black levels and can be thinner and lighter than liquid crystal display (LCD).

  5. Working principle:

  6. Working principle:

  7. Device Architectures • Bottom or top emission: • Transparent OLEDs: it much easier to view displays in bright sunlight • Inverted OLED:

  8. Device Architectures Stacked OLEDs :

  9. Material technologies Small molecules Molecules commonly used in OLEDs include organometallicchelates chelate Alq3 Tris(8-hydroxyquinolinato)aluminium Perylene Alq3 has been used as a green emitter, electron transport material and as a host for yellow and red emitting dyes.

  10. Polymer light-emitting diodes (PLED) • Polymer light-emitting diodes (PLED), also light-emitting polymers (LEP), involve an electroluminescent conductive polymer that emits light when connected to an external voltage. derivatives of poly(p-phenylenevinylene) and polyfluorene poly(p-phenylenevinylene) The first blue light emitting polymer diode was produced with a substituted polyfluorene polyfluorene

  11. Patterning technologies • Organicvapour jet printing (OVJP) • vapor thermal evaporation (VTE) • Color patterning

  12. Patterning technologies • Vacuum deposition is not a suitable method for forming thin films of polymers. • Polymers can be processed in solution, and spin coating is a common method of depositing thin polymer films. • The metal cathode may still need to be deposited by thermal evaporation in vacuum.

  13. Advantages AND Disadvantages Advantages • Lower cost in the future: • Light weight & flexible plastic substrates: • Wider viewing angles & improved brightness: • Better power efficiency: LCDs filter the light emitted • Response time

  14. Advantages AND Disadvantages Disadvantages Lifespan:The biggest technical problem for OLEDs was the limited lifetime of the organic materials a lifetime of around 14,000 Color balance issues Water damage UV sensitivity

  15. Manufacturers and Commercial Uses • Samsung applications • Sony applications • LG applications 15 inch 15EL9500

  16. References: • http://en.wikipedia.org/wiki/Organic_light-emitting_diode • http://en.wikipedia.org/wiki/Chelation • http://electronics.howstuffworks.com/oled1.htm • http://www.jbibbs.com/hdtutorial/futuretech.htm • http://www.oled-display.net • Sung-Jin Kim ,YadongZhang,Organic Electronics 12 (2011) 492–496 • M. Eritt , C. May a, K. Leo et al Thin Solid Films 518 (2010) 3042–3045

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