"Organic light-emitting diode (OLED) display is emerging as a credible flat-panel alternative thanks to some important advantages over LCDs. Unlike an LCD, an OLED does not need a backlight, which means that the display panel can be thinner. This is an important advantage in mobile devices. OLEDs also offer the potential for lower power consumption compared with an LCD, which is always constrained by the power consumption of the backlight. OLEDs supply power only to the pixels illuminated in a given image. OLED materials and device structures are becoming so efficient that an active-matrix OLED (AMOLED) a few inches in diagonal, showing video (on average 30% of full brightness), consumes less power than an equivalent LCD. In addition, because OLEDs can operate at high speed - around 100 times faster than an LCD - devices can support video rates without blurring."
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Original URL, circa 2006: http://optics.org/optics/Articles.do;jsessionid=8F8C7192ED727897AC1AEC2C26801F95?articleId=25148&channel=business