Engineers have created the first “active matrix” display using a new class of transparent transistors and circuits, a step toward realizing applications such as e-paper, flexible color monitors and “heads-up” displays in car windshields.
Flat-panel computer displays could be manufactured quickly and cheaply using novel inkjet printing equipment demonstrated by Japanese scientists.
The technique has already been used to produce the delicate wiring and tiny components needed for flexible screens. The new inkjet head is able to produce drops 1,000 times smaller than standard printers, according to the researchers. Writing in the journal PNAS, the team say the technique also improves the performance of printed circuits. “The present work demonstrates the feasibility of employing inkjet technology… for electronic device applications,” the University of Tokyo team write in Proceedings of the National Academy of Sciences.
“This technique can be applied for patterning high-purity electrically functional materials without preparing original patterning masks,” the researchers write. They were able to create finer details by applying a high voltage to the print head, causing drops in the inkjet to explode into one micron droplets. Using ink made of silver nanoparticles held in a solvent, the researchers printed continuous lines two microns wide and components just one micron across. Although these are large by current microprocessor standards – which can have features measured in nanometres (billionths of a metre) – the researchers believe it is good enough for use in TFT screens.
From InAVate Magazine
|Sony is to invest more than $200 million to develop OLED displays, while nitride-based laser production could get a boost from Blu-ray’s success against HD-DVD.|
|Sony Corporation has unveiled plans to invest approximately 22 billion yen (about $203 million) to strengthen middle and large size OLED (organic light-emitting diode) panel production technology. With this investment, Sony says it intends to accelerate the shift to middle and large size, high-image-quality OLED panels.Sony began researching OLED technology in 1994, and has since positioned OLED as a future next-generation display technology. In December 2007, Sony launched the world’s first OLED TV, “XEL-1” in Japan, incorporating Sony’s proprietary “Organic Panel” to realize extreme thinness and superb image quality through a high contrast ratio, high peak brightness, accurate color reproduction and rapid response time (see Sony begins selling world’s first OLED TV).
In order to advance the shift towards middle and large size, high image quality OLED panels, Sony has decided to invest from the second half of the fiscal year ending March 31, 2009 towards the further development of production technologies.
Sony will reinforce its TFT (thin film transistor) and EL (electroluminescent) layer coating processing facilities at Sony Mobile Display Corporation’s Higashiura factory, and plans to implement this production technology during the fiscal year ending March 31, 2010.
Sony says that it plans to continue to advance the development of OLED panels, positioning the OLED panel as a new device capable of expanding the future potential of televisions and other AV products.
A recent report from Frost & Sullivan estimated that the OLED display market earned revenues of $475.0 million in 2006, and that this will increase to $1.4 billion in 2013.
Blu-ray prevails in DVD format war
Sony’s Blu-ray Disc high-definition format has finally prevailed as the replacement for DVD after Toshiba announced that it would discontinue production of rival HD-DVD products.
Both formats use violet semiconductor lasers manufactured using the same indium gallium nitride (InGaN) material system that is used to make blue, green and white (phosphor-converted) LEDs.
Violet lasers were developed by Nichia, the world’s largest LED maker. However, most of the lasers used by Sony in its Blu-ray players, including the PlayStation 3 games console, are manufactured by Sony, which has a licensing agreement with Nichia.
From LEDs Magazine