An OLED device includes a pixel having a plurality of individually addressable
light emitting elements including a light emitting element for emitting white light,
and one or more light emitting elements for emitting colored light; at least one
of the light emitting elements being stacked on top of another of the light emitting
elements; and the white light emitting element(s) being more efficient than at
least one of the colored light emitting element(s).
