Universal Display was granted a new patent that describes a novel hybrid MEMS display that uses patterned red, blue and yellow sub pixels combined with a MEMS-LED display.
The idea here that the whole display sits on top of a blue-emitting edge-lit LED structure. The blue light only goes through small subpixel-sized "holes" which are controlled using tiny MEMS shutters. A blue LED is much more efficient and long lasting than a blue OLED, so the idea here is to combine the efficient red, green and yellow phosphorescent OLEDs with the efficient blue LED.
This seems a rather complicated display, and the blue backlight may degrade the contrast in this display. Still this is an innovative solution and it will be interesting to see whether UDC attempts to bring this to commercialization.