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Correction... the amount of light let through is based on the duration of time the mirror is flipped towards the lens. So I was mistaken too. It has to be able to respond 4x faster to support 4x the levels of color, and 2x faster to support 2 pixels per mirror, so that means it's a total of 8x faster.

These videos show renderings of the process in action:

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And this video interview with a TI rep at CES reveals they switch at up to 9000 times per second:

So even with 2 pixels X 6 colors in the wheel X 120 Hz x 2 (for on/off) = 2880 switches per second, leaving plenty of overhead.