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An organic light-emitting diode (OLED) is a special type of light-emitting diode in which the emissive layer comprises a thin-film of certain organic compounds. The emissive electroluminescent layer can include a polymeric substance that allows the deposition of suitable organic compounds, for example, in rows and columns on a flat carrier by using a simple "printing" method to create a matrix of pixels which can emit different colored light. Such systems can be used in television screens, computer displays, portable system screens, advertising and information, and indication applications etc. OLEDs can also be used in light sources for general space illumination.