[londons_explore]

Dithering in time seems like the best solution to this problem. Delta sigma modulation per pixel can be done reasonably easily.

Changing at 30Hz I doubt a human can tell the difference between slightly blue and slightly yellow.

[account42]

This is called frame rate control (FRC) in display terminology, at least when used for LCD displays where the panel has fewer distinct levels than the manufacturer wants to advertise.

[jorvi]

PWM and FRC aka headache generators deluxe