Rohm is showing a new OLED microdisplay at CEATEC. Unfortunately we do not have any information yet... beside a nice photo:

Back in 2007, Rohm unveiled a color OLED microdisplay prototype with 320x240 resolution, and said they were working on a 640x480 pixel one. We're guessing the new microdisplay has a higher resolution than that...

Kyulux - Hyperfluoresence OLED emittersKyulux - Hyperfluoresence OLED emitters