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Dispatches from the bleeding edge

Posts tagged with "OLED"

Stretchable Displays

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Researchers at the University of Tokyo have moved a step closer to displays and simple computers that you can wear on your sleeve or wrap around your couch. And they have opened up the possibility of printing such devices, which would make them cheap.

Takao Someya, an electrical-engineering professor, and his colleagues make a stretchable display by connecting organic light-emitting diodes (OLEDs) and organic transistors with a new rubbery conductor. The researchers can spread the display over a curved surface without affecting performance. The display can also be folded in half or crumpled up without incurring any damage.

In a previous Science paper, the researchers used their elastic conductor--a mix of carbon nanotubes and rubber--to make a stretchy electronic circuit. The new version of the conductor, described online in Nature Materials, is significantly more conductive and can stretch to more than twice its original size. What's more, it can be printed. Combined with printable transistors and OLEDs, this could pave the way for rolling out large, cheap, wearable displays and electronics.
Source: http://www.technologyreview.com/computing/22632/page1/

Spintronics Goes Organic

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In electronic circuits, transistors and memory devices process and store an electron's charge. Manipulating another property of electrons, the quantum-mechanical phenomenon known as spin, could lead to faster, smaller, and more energy-efficient computers.

University of Utah researchers have now taken a first step toward "spintronic" devices made from organic materials, which should be cheaper and easier to make than with materials used so far.

In a paper published in Nature Materials, the researchers outline a novel experiment that allowed them to measure the electron spins in an organic light-emitting diode (OLED).

Using a magnetic field, they were able to control the material's spin state, which also changed the electric current coming out of the device.

Source: http://www.technologyreview.com/Infotech/21289/?a=f

Engineers make first 'active matrix' display using nanowires

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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.

The transistors are made of "nanowires," tiny cylindrical structures that are assembled on glass or thin films of flexible plastic. The researchers used nanowires as small as 20 nanometers - a thousand times thinner than a human hair - to create a display containing organic light emitting diodes, or OLEDS. The OLEDS are devices that rival the brightness of conventional pixels in flat-panel television sets, computer monitors and displays in consumer electronics.

Source: http://physorg.com/news126202412.html

See-Through Transistors

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Organic light-emitting diode (OLED) displays are currently found on mobile phones and digital cameras. But in the future, manufacturers expect bigger, bendable, and completely transparent versions. They envision bright maps on visors and windshields, television screens built into eyeglasses, and roll-up, see-through computer screens. And although the OLEDs themselves can be transparent, to make a clear display, the transistors that control each display's OLED, or pixel, need to be transparent as well.

Researchers at Purdue University and Northwestern University have now made flexible, see-through transistors using zinc-oxide and indium-oxide nanowires. By contrast, the amorphous or polycrystalline silicon transistors used in existing displays are not transparent. The new transistors also perform better than their silicon counterparts and are easier to fabricate on flexible plastic.

Source: http://www.technologyreview.com/Nanotech/18818/

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