Martin R. Green wrote:
>
>> In general, to get a multiplexed LED to display the same brightness as a
>> direct driven LED you should overdrive each segment by the duty cycle of
>> the scan.

Bob Fehrenbach wrote:
>I don't believe this is true.  The human eye seems to respond more to
>the  PEAK of the intnesity.  Thus only a marginal decrease in
>brightness is observed when the displays are mux'd at 20 ma in your
>example.

I have tried this peak response test since I saw it being mentioned in The
Art of Electronics. There, it is said that it is better to have 160 mA
multiplexed than 20 mA continuous, because of our eyes' peak response (we
would see it brighter, being multiplexed); well, it definitely does not
happen to me.

Also, I see a major difference between mux'd 20 mA and continuous 20 mA. I
tested this with red LEDs, LCDs backlights, everything. Maybe it's me.