Page "OLED" Paragraph 56

; Color balance issues: Additionally, as the OLED material used to produce blue light degrades significantly more rapidly than the materials that produce other colors, blue light output will decrease relative to the other colors of light.

This variation in the differential color output will change the color balance of the display and is much more noticeable than a decrease in overall luminance.

This can be partially avoided by adjusting colour balance but this may require advanced control circuits and interaction with the user, which is unacceptable for some users.

In order to delay the problem, manufacturers bias the colour balance towards blue so that the display initially has an artificially blue tint, leading to complaints of artificial-looking, over-saturated colors.

More commonly, though, manufacturers optimize the size of the R, G and B subpixels to reduce the current density through the subpixel in order to equalize lifetime at full luminance.

For example, a blue subpixel may be 100 % larger than the green subpixel.

The red subpixel may be 10 % smaller than the green.