All of these technologys will be obsolete within 5 years, so quite frankly the lamp life of plasma is pretty much a dead issue. OLED will dominate the market for displays, it makes Plasma and LCD Tv's look like big hulking obsolete machines.
Imagine a display less than 2mm thick that is flexable enough to roll up, has no size restrains, potentially better than 1080i resolution, requires less power, and does not lose its brightness, and costs way less than PLASMA or LCD to manufacturer.
There are already small prototype TV's made of this technology.
-here is somthing i found off a quick yahoo search
OLED Key Benefits
OLED displays offer more vivid images and crisper video without a backlight and are therefore thinner and lighter than conventional displays. Below are key benefits of OLED
displays.
Thinner, lighter: AM OLED screens are just 1.5 millimeters thick - about the thickness of a quarter and a fraction of the size possible in LCD displays.
Clearer, brighter: AM OLED displays have a refresh rate 1000 times faster than LCD, for fluid, clearer full-motion video. OLED luminance range is far greater than human perception and displays can brighten or dim while maintaining image contrast, shadows and highlights.
Wider viewing area: OLED displays have a wider viewing angle (up to 165 degrees) than LCD displays, even in bright light.
Lower power consumption: OLED panels typically operate at 2 to 10 volts. Since OLED pixels only use power when they are lit, the displays can be more efficient than LCD screens, which have backlights that are always on at full brightness.
here is more on it..............
http://cgw.pennnet.com/Articles/Article_Display.cfm?Section=Articles&Subsection=Display&ARTICLE_ID=173726