Semiconductor presentation revised us
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This document summarizes a research article that introduces printable elastic conductors and describes how they can be used to create a stretchable active-matrix organic light emitting diode (OLED) display. The key points are: 1) Printable elastic conductors are produced using a technique that prints conductive inks made of highly elastic fluorinated rubber and dispersed single-walled carbon nanotubes, which allows the conductors to be highly conductive yet stretch over 118%. 2) Using these printable elastic conductors, the authors constructed a stretchable active-matrix OLED display by printing transistors and LEDs on rubber sheets and connecting them via the elastic conductors. 3) This stretchable display technology could enable
Semiconductor presentation revised us
- 2. Based on a review article written by: Tsuyoshi Sekitani, Hiroyoshi Nakajima, Hiroki Maeda, Takanori Fukushima, Takuzo Aida, Kenji Hata and Takao Someya which was published on 10th May, 2009 in Nature Material this presentation aims at introducing what printable elastic conductors are and how they can be used in the varied field of semiconductors for the better use of humanity. Stretchability will significantly expand the applications scope of electronics, particularly for large-area electronic displays, sensors and actuators. Unlike for conventional devices, stretchable electronics can cover arbitrary surfaces and movable parts.However, a large hurdle is the manufacture of large-area highly stretchable electrical wirings with high conductivity. Here, we describe the manufacture of stretchable active matrix OLED display using printable elastic conductors.
- 3. Active-matrix is basically a type of addressing scheme (pixel state) used in flat panel displays like LCD TV screens. Recently new technologies have been emerging in the field of “stretchable” electronics like the development of elastic electrical wiring that is both highly conductive and highly stretchable . Although there have been examples of these kind of materials been made like graphene films coated with metal; problem that has arose is to find a procedure to make such materials larger in size. One solution to this problem that has been provided by the authors in this article is to develop printed elastic conductors which are extraordinarily conductive and use that to construct a rubber-like stretchable active-matrix display.
- 4. What do one exactly mean by a printed elastic conductor? The authors provide a technique of producing stretchable OLED’s by using the principle of direct printing technologies i.e. printable inks that have high conductivity and stretchability to make printed elastic conductors which consists of fine SWNT bundles uniformly dispersed in a highly elastic fluorinated rubber matrix which is quite viscous. The chemically stable SWNTs (high purity) act as highly conductive dopants and help in forming well developed conducting networks in rubber. Advantages of printed elastic conductors No requirement of any kind of extra coating of metal unlike other conductors (e.g. graphene films) No requirement of any huge mechanical process unlike others like wavy thin metals It can stretch by a huge margin (118%) Has an extraordinarily high conductivity (102 S/cm)
- 6. Basic idea of organic light emitting diode After making the elastic conductors the authors explains a process of manufacturing Organic LEDs and organic driving cells separately on PDMS sheets which are then joined together to form a highly stretchable display. An active matrix was then fabricated on a flexible polyimide film using a special process called vacuum evaporation. By integrating the active matrix and organic LEDs using printed elastic conductors a stretchable active-matrix Organic LED display was finally manufactured. Bending or crumpling causes no mechanical or electrical damage because of the excellent conductivity and mechanical durability of the printed elastic conductors , organic transistors organic LEDs manufactured on the special rubber.(PDMS rubber)
- 8. The stretchable materials and manufacturing technology like printed electronics used in this study can also be used to create other types of useful electronics such as rubber-like electrical artificial skin with a stretchable active matrix and pressure sensors. The combination of stretchable sensors and displays can be used to create real, tangible displays and user-friendly human-machine interfaces on all kinds of surfaces and of shapes. Active research is still being done in this regard by many international electronic companies like Visionox and Samsung. Research on finding materials regarding these types of printed conductors is going on in full flow by well-known scientists in major universities like Stanford University , Yale University etc.
- 10. Thus we can find that, the printable elastic conductor developed in this work enables the construction of electronic integrated circuits that can spread over any surface including curved and movable parts. This would significantly expand the areas where electronics can be used. This is an important step towards the development of the infrastructure for the coming era of ambient electronics in which a large number of electronic devices such as sensors and display networks function as user friendly human-machine interfaces that can be used in daily life to enhance security, safety and convenience and also as wearable technology.
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