This course will cover the multidisciplinary aspects of the emerging display technology based on organic light-emitting devices (OLEDs) fabricated from molecules and polymers. It will review the basic concepts of polymer chemistry necessary to understand current organic photonic materials, and describe the physical processes of charge injection, charge transport, and light-emission in organic amorphous thin films. Then, different classes of organic electroluminescent devices and their properties will be described. The state-of-the-art in device performance and the properties of different display technologies will be discussed. Projections for future performance levels will be made based on the current theoretical understanding of organic materials.