Flexible electronics, which are key to the production of portable devices with displays that bend and fold-thanks to the use of polymer materials-is a rapidly growing field, driven by consumer demand for smaller, lighter, and higher-performing electronic products with larger displays. Flexible displays and circuit technologies offer distinct advantages over rigid printed circuit boards and liquid-crystal displays in digital cameras, cell phones, e-book readers-the list goes on. Thin plastic films, substrates, coatings, and plastic-based inks play a vital role in the development of these products.