Se ha denunciado esta presentación.
Utilizamos tu perfil de LinkedIn y tus datos de actividad para personalizar los anuncios y mostrarte publicidad más relevante. Puedes cambiar tus preferencias de publicidad en cualquier momento.

Flexible Electronic display ppt,VTU format

power point presentation on flexible electronic display i.e foled and gyricon displays.VTU seminar format.

  • Inicia sesión para ver los comentarios

Flexible Electronic display ppt,VTU format

  1. 1. FLEXIBLE ELECTRONIC DISPLAYPresented By: Vinesh C.H 1AY11EC122 BEEC,AIT Guided By: Prof Sujatha B.M Associate Professor Dept. of E&C,AIT Department of Electronics & Communication, Acharya Institute Of Technology 1
  2. 2. WHAT’S IN IT FOR YOU TODAY ??? 2
  3. 3. OBVIOUSLY!!! NOTHING BUT ,ALL ABOUT FLEXIBLE e-DISPLAY 3
  4. 4. WHY? WHY? WHY? 4
  5. 5. DO YOU EVER WISH TO SEE YOUR CELL PHONE IN THIS STATE ??? 5
  6. 6. PRESENTATION ROAD MAP 6
  7. 7. PRESENTATION ROAD MAP 7
  8. 8. HISTORY 8
  9. 9. HISTORY • Nicholas K. Sheridon invented Gyricon at Xerox Palo Alto Research Center (Xerox PARC), In the 1970’s • Eventually became the basis of the e-paper. • Cost-inefficient. • Gyricon and E-paper never had much success, but was on the right track. 9
  10. 10. PRESENTATION ROAD MAP 10
  11. 11. PRE-REQUISITES 11
  12. 12. PRE-REQUISITES 1.Flexible Substrates 2.Encapsulation 3.Organic and Inorganic Conducting Layers 4.Electro-optic Materials 5.Thin Film Transistors 12
  13. 13. 1.Flexible Substrates • The primary flexible substrate candidates are plastics and thin glass. • Plastic substrates are inexpensive, roll- to roll processable and can be laminated to multi-layers. • Thin glass substrates exhibit better thermal stability and have higher visual transparency than plastics, but cannot fully bend. 13
  14. 14. 2.Encapsulation •Since flexible displays utilize organic materials, a barrier layer is essential in protecting and enclosing the functional materials and layers from oxygen and degraded water. •Since organic materials tend to oxidize and hydrolyze, oxygen and water permeation through a flexible substrate is of particular importance flexible electronics. 14
  15. 15. 3.Organic andInorganic Conducting Layers • Indium tin oxide (ITO) is the typical conducting layer used in display technology because of its excellent optical clarity. • When ITO is deposited on a polymeric substrate, it can crack under tensile strain and cause catastrophic failure. • Conducting polymers are also being considered for flexible display applications. • There is a new conducting substrate technology based on nanotechnology. 15
  16. 16. 4.Electro-optic Materials • The various types of electro-optic materials for flexible display fall into three categories – emissive, reflective, and transmissive. • In order to have a truly low power display, a reflection mode of operation will have to be implemented on flexible substrates. • Polymer-dispersed liquid crystals, encapsulated electrophoretics, gyricon, and bi chromic ball composites all operate in the reflective mode. 16
  17. 17. 5.Thin Film Transistors • A thin-film transistor (TFT) is a special kind of field-effect transistor. • Made by depositing thin films of an active semiconductor layer as well as the dielectric layer and metallic contacts over a supporting substrate. • A common substrate is flexible glass. • This differs from the conventional transistor, where the semiconductor material typically is the substrate, such as a silicon wafer. 17
  18. 18. PRESENTATION ROAD MAP 18
  19. 19. TYPES OF FLEX-DISPLAY 19
  20. 20. TYPES OF FLEX-DISPLAY 1.F-OLED DISPLAY 2.GYRICON DISPLAY 3.FLEXIBLE LCD DISPLAY 4.ELECTROPHORETIC DISPLAY 5.E PAPER 20
  21. 21. 1. F-OLED DISPLAY • Organic light emitting diodes (OLED) display is another promising technology for flexible flat panel displays. • Works on the principle of ELECTROPHOSPHORESCENCE • Flexible OLEDs are very lightweight and durable. Their use in devices such as cell phones and PDAs can reduce breakage. 21
  22. 22. F-OLED DISPLAY STRUCTURE 22
  23. 23. F-OLED DISPLAY HOW IT EMITS LIGHT ?? 1. Electrical current flows from the cathode to the anode through the organic layers,giving electrons to the emissive layer and removing electrons from the conductive layer. 2. Removing electrons from the conductive layer leaves holes that need to be filled with the electrons in the emissive layer. 3. The holes jump to the emissive layer and recombine with the electrons. As the electrons drop into the holes, they release their extra energy as light. 23
  24. 24. F-OLED DISPLAY TYPES • PM-FOLEDs have strips of cathode, organic layers and strips of anode. The anode strips are arranged perpendicular to the cathode strips • The intersections of the cathode and anode make up the pixels where light is emitted. • The brightness of each pixel is proportional to the amount of applied current. PASSIVE MATRIX OLED 24
  25. 25. F-OLED DISPLAY TYPES • AM-FOLEDs have full layers of cathode, organic molecules and anode, but the anode layer overlays a thin film transistor (TFT) array that forms a matrix. • The TFT array itself is the circuitry that determines which pixels get turned on to form an image. • AM-FOLEDs consume less power than PMOLEDs because the TFT array requires less power than external circuitry, so they are efficient for large displays. ACTIVE MATRIX OLED 25
  26. 26. 2. GYRICON DISPLAY STRUCTURE • Gyricon are spherical beads with one black and one white hemisphere. • The spheres are only 100um in diameter and make a display that is only 200um thick. • In the display, the beads are dispersed in a transparent rubber sheet and suspended in oil, allowing it to rotate in response to an electric field. • The electric field is applied by the transparent electrode 26
  27. 27. GYRICON DISPLAY WORKING • When voltage is applied to the surface of the sheet, the beads rotate to present one colored side to the viewer. • Voltages can be applied to the surface to create images such as text and pictures. • The image will persist until new voltage patterns are applied. 27
  28. 28. PRESENTATION ROAD MAP 28
  29. 29. COMPARISION 29
  30. 30. COMPARISION Comparison of Flexible Screens (F-OLED's) vs. LCD Screens (LED) Cost Durability Weight Speed Applications Flex Screens (F-OLED) High: Cannot mass produce. Low cost technology isn't available yet. Durable: Mostly made of flexible plastic. Hence it doesn’t shatter. Lighter: Potential to be just a thin sheet of plastic. Faster: More responsive to touch. Unlimited:Can be applied to curved or round services. LCD Screens (LED) Low: Ability to mass produce. Fragile: Screen is made of glass and will shatter Heavier: Requires glass and more support layers. Slower: Older technology Limited: Requires a flat, straight surface. 30
  31. 31. PRESENTATION ROAD MAP 31
  32. 32. VIDEO 32
  33. 33. 33
  34. 34. REFERENCES • Cashmore, Peter. "Why Your next Phone Might Be Bendable." CNN. Turner Broacasting System, Inc., n.d. Web. 15 Apr. 2013. <http://www.cnn.com/2011/10/31/tech/innovation/flexible-screens- cashmore/index.html?iref=allsearch>. • Genuth, Iddo. "The Future of Electronic Paper." The Future of Electronic Paper. The Future of Things, 2013. Web. 15 Apr. 2013. <http://thefutureofthings.com/articles/1000/the-future- of-electronic-paper.html>. • Grose, Thomas K. "OLEDs: The Light Idea." Time. Time, 2013. Web. 15 Apr. 2013. <http://www.time.com/time/magazine/article/0,9171,2005725,00.html>. • Nikamahjan. "OLED Advantages and Disadvantages." OLED Advantages and Disadvantages. Expertscolumn, 2013. Web. 15 Apr. 2013. <http://expertscolumn.com/content/oled-advantages-and-disadvantages>. • OLED-Info. "Flexible OLED Displays." Flexible OLED Displays. Metalgrass Software, 2013. Web. 15 Apr. 2013. <http://www.oled-info.com/flexible-oled>. 34

×