Transflective display having full color OLED blacklight

A transflective display device comprising a light modulating element positioned adjacent to an emitting surface of an OLED backlight, said OLED backlight comprising:

• a first OLED disposed on a light scattering substrate element, the light scattering substrate element having a rough surface, the first OLED comprising:
• a first conductive layer that is reflective disposed over the light scattering substrate element, wherein the shape of the rough surface on the substrate element is imparted to the reflective first conductive layer;
• a first organic layer comprising an emissive material that emits light in a first bandwidth;
• a second conductive layer that is transmissive;
• a second OLED positioned adjacent an emitting surface of the first OLED, the second OLED comprising:
• a third conductive layer that is transmissive;
• a second organic layer disposed over the third conductive layer, the second organic layer comprising an emissive material that emits light in a second bandwidth different from the first bandwidth;
• a fourth conductive layer that is transmissive disposed over the second organic layer.

A transflective display device comprising a light modulating element and an OLED backlight, said OLED backlight comprising:

• a substrate having a rough surface;
• a first electrode comprising a reflective material disposed over the substrate at the side of the rough surface, wherein the shape of the rough surface on the substrate is imparted to the first electrode;
• a second electrode disposed over the first electrode, the second electrode comprising a transmissive material;
• a first organic layer including an emissive material disposed between the first electrode and the second electrode;
• a third electrode disposed over the second electrode, the third electrode comprising a transmissive material;
• a second organic layer including an emissive material disposed between the second electrode and the third electrode;
• wherein the first electrode is the only significantly reflective layer in the device.