Conventional backlit flat displays work with the principle of emitting light. E-paper or electronic paper (also called EPD: Electronic Paper Display) are display devices that reflect light just like ink on paper. Just like ordinary paper, the characters on an e-paper are visible even in direct sunlight. E-papers are perfect displays since the image remains fixed even after the power is switched off, thus consuming extremely low energy. In this short article we will be looking at the history, operating principles, advantages and disadvantages, and the future of e-paper displays.