With passage of time technology has been improving and importance is increasing for display system as it used for various applications. LED, Light Emitting Diode, were first to emerge consuming less energy and with long life for different display applications in solid semiconductor technology after vacuum tube technology, CRT, Cathode Ray Technology, which were in use before LED. It used to consume large power and life was also less. LED are further improved and Organic LED (OLED) has imaged now providing display system which consume least power and is transparent when not in use. OLED can provide viewing angle much more than other display systems, even up to 160 degrees.