There is a new technology on the way that we should see available in HDTV and other screens, along with Laser HDTV, called OLED. OLED (Organic light-emitting diode) displays as a brand new technology with several clear advantages over current LCD and plasma displays. Firstly OLED displays are much more energy efficient (as much as 40% more efficient) than LCDs, also they are even thinner than LCD TVs as there is no backlight required.
OLED displays are currently being used in small scale devices such as cell phones, car radios and mp3 players, also Sony plans on releasing some smaller OLED HDTVs later this year. Reuters have more information on OLED here.