A method of making an improved color OLED display device, includes the steps
of:
identifying a plurality of different OLED materials having differing chromaticity
coordinates, luminance stability over time, and luminance efficiency; calculating
an estimate of display lifetime for a plurality of combinations of the different
OLED materials used to produce a pixel having a white point with a defined chromaticity
coordinate and luminance; and selecting the combination having the maximum lifetime.
