Dictionary
backplane
noun
A circuit board that connects several connectors in parallel to each other, so that each pin of each connector is linked to the same relative pin of all the other connectors, forming a computer bus.
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Amorphous-silicon transistors could also be used to make the "backplane" circuitry inside flat-panel computer displays.
With a traditional LCD, the frontplane is also made of a rigid piece of glass, and the "cell gap" between it and the backplane must be precisely maintained.
Ideally, the backplane should have a transistor under each pixel, so that the pixel can be turned on and off without affecting its neighbours.
Transistors and other circuitry can then be printed on to a flexible plastic substrate.So much for the backplane; the frontplane presents its own challenges.
Try this approach with a flexible plastic backplane, and it will simply melt.How to be more flexibleOne promising way around this problem, being pursued by Philips Polymer Vision, Plastic Logic and other firms, is to make the transistors themselves out of plastic specifically, out of organic polymers.
The usual approach is to deposit silicon on the backplane and then etch the transistors into it in the usual way, but this can only be done if the backplane is made of glass with a very high melting point.
He still winces at the memory of loose contacts on a computer's backplane and components that died as they were being tested or "burnt in" (a phenomenon known as "infant mortality").
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But the combination of organic electronic backplanes and electrophoretic frontplanes could produce truly rollable, albeit monochrome, displays in the not-too-distant future.
Plastic Logic's first commercial application is likely to be as backplanes for liquid-crystal displays or electronic paper.
It is now installing equipment to enable it to make such backplanes at paperback (A5) size, and then plans to move on to 150ppi displays at magazine (A4) size.
Plastic Logic, which entered into a co-operation agreement with E Ink in December, has already produced backplanes with a resolution of 100 pixels per inch (ppi), the same as a laptop LCD.
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