Top-emitting OLED device with light-scattering layer and color-conversion

A top-emitting OLED device, comprising:

• one or more OLEDs formed on a substrate, the OLED including a first electrode formed over the substrate, one or more layers of light-emitting organic material formed over the first electrode, and a transparent second electrode formed over the one or more layers of light-emitting organic material;
• a light-scattering layer formed over the one or more OLEDs for scattering light emitted by the one or more layers of light-emitting organic material;
• a transparent cover;
• one or more color filters formed on the transparent cover;
• a color-conversion material layer formed over the color filters, or formed over or integral with the light-scattering layer;
• wherein the substrate is aligned and affixed to the transparent cover so that the locations of the color filters and color conversion material correspond to the location of the OLEDs, and the color-conversion material layer, color filters, and the light-scattering layer are between the cover and substrate, and a low-index gap is formed between the light-scattering layer and the color filters, with no light-scattering layer being positioned between the color conversion material layer and the low-index gap,
• wherein the one or more layers of light-emitting organic material emit broadband light that contains at least two colors of light, the color-conversion material layer comprises material that converts relatively higher frequency components of the broadband light to lower frequency light, and the color filters are correspondingly patterned with the color-conversion material layer to form sub-pixel elements emitting different colors of light.