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August 7, 2013 AT 2:02 am

Really, really big ITO (indium tin oxide) LED sign

This impressive glass sign — with seemingly magical embedded white LEDs — stands nearly ten feet tall. Examine it very closely and you’ll see a network of fine lines. Many assume those are wires, but they’re actually insulators with the LEDs bridged across them. The glass is coated with indium tin oxide, a transparent conductor used in LCD screens, and these scratches isolate areas of different electrical potential. Power is delivered via wires concealed in the edge supports. The principle is exactly the same as the ITO-coated plastic and glass in the Adafruit shop, on a much grander scale.


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