Abstract: This paper presents the concept of organic light emitting diode (OLED) as a modern trend in opto-electronic devices. OLED display technologies make it possible to get significant improvement in the bright light output, image resolution and the pixel response time with low operating voltages. These extremely thin devices consist of layers of organic molecules which emit light with application of electric current. The self-luminous devices made from OLEDs eliminate the need of backlight unlike Liquid Crystal Display (LCD) display. With recent development in manufacturing techniques, reduced costs are a remarkable factor. These all features increase worldwide adaptability and popularity of OLED.

Keywords: OLED, Electroluminescent, Liquid Crystal Display (LCD), AMOLED, PMOLED