"The crucial distinction is that CNT-FED uses inorganic material, so the overall stability of CNT-FED technology is greater than that of OLED. One company claims that they could make a white OLED backlight and apply it to some consumer devices where lifetime is not a concern. But if you tried to use the same backlight in a TFT-LCD TV, then the long-term reliability of the material would become an important issue.
Generally, CNT-FED technology offers all the advantages of OLED – there is no need for a BLU; there are fast response times; there is a wide viewing angle and excellent color quality – but the lifetime of the CNT-FED would be much longer."