> You'll see the strobing in commercial units if either they're
> scanned reasonable slowly (the result will be tilted characters
> as the LEDs in successive rows appear to lag behind - the
> fewer the number of LEDs you assign to a block, the smoother
> the result) or you flit your eyes while looking. Same flashing you
> see in a LED lit by AC

perhaps it is possible to have some LED's on completely, while strobing
only the ones needed to fill out the character or pattern......?


> > I don't think my 4mhz 16f84 is going to do too much heavy
> > lifting here.....

here I actually was wondering if a 4mhz 16F84 is fast/powerful enough to
present a good display.....now that my little experimenter set up is working
,
I have it sitting here counting up through 65K and shifting it out to
the register, to the matrix....and without the transistors it kinda dim,
in a dim room....but I also have a row of 16 single led's to check the
register pin too, I'm on led overkill here.........so maybe without this
drain...

could a darlington transistor array be used in this application?  I was
looking at
a ULQ2003A, and was wondering if that could be connected somehow...I get
the idea of how the individual transistors make the circuit, but this array
isn't
obvious to me how to hook it up....

anyway, off to tinker,
thanks for you help...


>
> Nah. Apart from sending data to the shift registers and timing
> the display delays it's not got much to do
>
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