On 21/10/2010 15:15, Joe P. Farr wrote:
> Olin,
>
> Not to disagree with you, but according to Maxim's app note 1883
> (http://www.maxim-ic.com/app-notes/index.mvp/id/1883) which, perhaps
> incorrectly I've always assumed was correct.
>
> Quote:
> An advantage of pulse drive is that the human eye behaves as a partially
> integrating and partially peak-reading photometer. As a result, the eye
> perceives rapidly pulsed light somewhere between the peak and the
> average brightness. This means that a low-duty-cycle, high-intensity
> pulse of light looks brighter than a DC signal equal to the average of
> the pulsed signal. An advantage of multiplexed operation, therefore, is
> an improvement in display intensity for a given average power
> consumption.
>
> If I'm wrong, I'm happy to be corrected and learn something new every
> day.
It's true up to a point, but not at higher brightnesses as the switching=20
and ohmic/Heating losses increase.
--=20
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