Hi there,

Here is a short description of the advantages of an OLED Display.

http://www.cmel.com.tw/CMELWEB_EN/004.asp

The most important difference between a LCD and an AMOLED is, that the best homogeneous color for the OLED is black, whereas the LCD can stay white all the time.

If you want to increase the lifetime of your OLED you have to follow some guidelines which can be found here!