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Joined: Dec 2008
21-09-2008, 10:46 AM
With the imaging appliance revolution underway, the need for more advanced handheld devices that will combine the attributes of a computer, PDA, and cell phone is increasing and the flat-panel mobile display industry is searching for a display technology that will revolutionize the industry. The need for new lightweight, low-power, wide viewing angled displays has pushed the industry to revisit the current flat-panel digital display technology used for mobile applications. Struggling to meet the needs of demanding applications such as e-books, smart networked household appliances, identity management cards, and display-centric handheld mobile imaging devices, the flat panel industry is now looking at new and revolutionary form of displays known as Organic Light Emitting Diodes (OLED).
OLEDs offer higher efficiency and lower weight than many other types of displays, and are present in myriad forms that lend themselves to various applications. Many exciting virtual imaging applications will become a reality as new advanced OLED - on - silicon micro displays enter the market place over the next few years.
The field of semi conducting polymers has its root in the 1977 discovery of the semi conducting properties of polyacetylene. This breakthrough earned Alan Heeger, Alan MacDiarmid, and Hideki Shirakawa the 2000 Nobel Prize in Chemistry for 'the discovery and development of conductive polymers'. The physical and chemical understanding of these novel materials has led to new device applications as active and passive electronic and optoelectronic devices ranging from diodes and transistors to polymer LEDs, photodiodes, lasers, and solar cells. Much interest in plastic devices derives from the opportunities to use clever control of polymer structure combined with relatively economical polymer synthesis and processing techniques to obtain simultaneous control over electronic, optical, chemical, and mechanical features.
With the imaging appliance revolution underway, the need for more advanced handheld devices that will combine the attributes of a computer, PDA, and cell phone is increasing and the flat-panel mobile display industry is searching for a display technology that will revolutionize the industry. The need for new lightweight, low-power, wide viewing angled, handheld portable communication devices have pushed the display industry to revisit the current flat-panel digital display technology used for mobile applications. Struggling to meet the needs of demanding applications such as e-books, smart networked household appliances, identity management cards, and display-centric handheld mobile imaging devices, the flat panel industry is now looking at new displays For the preparation of the latest materials to prepare against this onslaught of demand for lighter and less power hungry display technologies, electrical engineers have enlisted the help of the humble jellyfish in their efforts to develop better light-emitting diodes (LEDs),Moreover, the jellyfish accomplishes this with great efficiency: its lightcomes from a substance dubbed green fluorescent protein (GFP), which collects the energy produced in a certain cellular chemical reaction and emits it as green light from a molecular package known as a chromophore.
An OLED is an electronic device made by placing a series of organic thin films between two conductors. When electrical current is applied, a bright light is emitted. This process is called electro phosphorescence. Even with the layered system, these systems are very thin, usually less than 500 nm (0.5 thousandths of a millimeter). known as Organic Light Emitting Diodes (OLED).
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Joined: Apr 2012
31-07-2012, 03:26 PM
Organic LED Displays (OLEDs)
Organic_LED_Displays.pdf (Size: 330.27 KB / Downloads: 55)
Wouldn't you like to be able to read off the screen of your laptop in direct sunlight? Your mobile phone
battery to last much, much longer? Or your next flat screen TV to be less expensive, much flatter, and even
flexible? Thanks to a breakthrough technology called Organic Displays, this could soon be reality.
Although the technology behind Organic LED (OLED) displays is pure chemistry, the applications are much
more everyday - mobile telephone and television screens, laptop and stereo displays, car navigation systems,
or even billboards.
This OLED technology is based on a revolutionary discovery that light-emitting, fast switching diodes could
be made from polymers as well as from semiconductors. Starting from a standard LCD glass covered with
structured ITO (Indium-Tin-Oxide), the polymer materials are applied by precision ink jet printing. Using this
technology, pixels of red, green, and blue material are applied. After the patterned cathode has been applied
via metal evaporation, the cell is sealed.
Philips states that the big advantage of the manufacturing process is its simplicity and therefore its potential
for low cost; only a very limited number of process steps are needed. This procedure requires fewer
manufacturing steps than the manufacturing of LCDs, and, more importantly, fewer materials are used. In
fact, the whole display can be built on one sheet of glass or plastic, so it should be cheaper to manufacture.
Philips' thin-film PolyLED technology will enable the production of full-color displays less than 1 mm thick.
Combined with a large viewing angle, high brightness and contrast, and full video capability, PolyLED
displays are ideal for the next generation of information displays.
Advantages of Plastic Electronics
One big advantage of plastic electronics is that there is virtually no restriction on size. Conventional
semiconductor components have become smaller and smaller over the course of time. Silicon is the base
material of all microelectronics and is eminently suited for this purpose. However, the making of larger
components is difficult and therefore costly. The silicon in semiconductor components has to be mono
crystalline: it has to have a very pure crystal form without defects in the crystal structure. This is achieved by
allowing melted silicon to crystallize under precisely controlled conditions. The larger the crystal, the more
problematic this process is. Plastic does not have any of these problems, so that semi-conducting plastics are
paving the way for larger semiconductor components.
Philips and PolyLed
Since the discovery of polymer-based light emitting diode (LED) in 1989, Philips has been working on
PolyLED. Today, Philips is the first to ship monochrome PolyLED displays in mass production. Philips
Research is now concentrating on the development of PolyLED technologies for next-generation full-color
displays and on ways of integrating PolyLEDs into flexible displays.
Launched in September 2002, the Sensotec Philishave is the first ever product equipped with a display based
on superior PolyLED technology and is prominently featured in the latest James Bond movie, Die Another
In 2002, SANYO, Kodak, and SKD shipped 300 OLED displays for trial use in mobile phones. In order to
increase production of low temperature poly-silicon TFT LCD displays, the demand for which currently
exceeds capacity and in order to establish a mass production infrastructure required for full scale mass
production startup of OLED displays, a factory of Tottori SANYO Co., Ltd. was placed under the control of
SANYO LCD Engineering Co., Ltd. in February of 2003. The manufacturing line used for the production of
amorphous silicon TFT displays is was shifted over to the production of low temperature poly-silicon TFT
displays. Production of Low temperature poly-silicon TFT displays on the converted line began in April of
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