OLED is expensive today due to a complex and expensive process to manufacture the panels because it requires a vacuum evaporation and shadow making techniques. This process is inefficient as it takes more time to make than any other display technology. The yield on the panels is also currently lower than traditional display panel.
However, a US company called YieldJet is aiming to disrupt the current process with a new system that essentially uses a giant inkjet printer that places OLED pixes on glass or plastic in a nitrogen chamber vs. the current way of placing ink on paper.
This process is capable of mass producing OLED panels.
This technology should help OLED TV's take off in 2016 with a substantial reduction in price. Let's see what the Japanese and Koreans do in streamlining their current tech.