I don't know of any site but this is basically what it is doing.

The human eye has a scan rate of about 50 frames per second.  That means
that if you flash something less than 50 times per second (lets pick 20),
you will see the pulses or flashing.  Above 50 times per second (lets say
70), the human eye will see it as being constantly on. Knowing this, we can
flash out LED display at a rate faster than 50 times per second and won't
notice a thing.

Time division multiplexing means that we only display 1 digit at a time.
First we display the one's digit, then we display the 10's digit, then we
display the 100's digit, then we display the 1000's digit, etc.  If we can
display all the digits (one at a time) more than 50 times per second, you
shouldn't notice any flicking.

You will have two sets of control lines to handle this.  One will be the
digit information and these lines will all be tied together at each
display.  You will have a seperate set of control lines telling which digit
we are displaying at any given time.  Only one of these lines will be active
at any one time.  This 2nd set of control lines connect to either the common
anode or common cathode depending on what type of LED display your useing.

ckchan wrote:

> Greetings,
>
> pls point me to site that have this information about time division
> multiplexed for LED display. i'm having hard time understanding how they
> scan out a character. thanks.
>
> regards,
> ckchan
>
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