For the Optimus-103 OLEDs have to be custom-made. We have to choose the manufacturer next week (there are some of them), define the specs and finance every production stage including the tooling. Tooling itself costs a minimum of US$70-100k. Production cycle takes at least three months. Every display costs about US$10. Multiply that by the number of active keys.

Read more here (Art.Lebedev blog) 

Merck - Advancing Display, Advancing LifeMerck - Advancing Display, Advancing Life